What is the psychology of customers who decide to "buy" on your own e-commerce site? Why do reviews influence sales?

[Updated February 2026 · Definitive Edition] Now that AI Overview and ChatGPT Search have become standard features, search engines prioritize "information reliability" over "the volume of keywords." What do customers visiting your proprietary e-commerce site look at before clicking the "Buy" button? Based on the latest statistical data and research findings from Northwestern University, we provide a comprehensive breakdown of review strategies and customer psychology that can boost sales by up to 3.7 times.

1. Customers who visit your own e-commerce site are already thinking, “I want to buy this”

Customers who go out of their way to visit a brand’s own e-commerce site (rather than shopping malls like Amazon or Rakuten) share a distinct characteristic.

According to Excrie’s “Survey on Online Shopping Behavior (2025),” the primary reason consumers choose a brand’s official online store is “to ensure they are purchasing genuine, authentic products.” Customers visiting a brand’s own site are likely already highly interested in that brand or product and have the intention to “buy from this store.”

On the other hand, the same survey shows that economic benefits such as “points” and “low prices” rank highest among the reasons for choosing marketplaces. In other words, marketplaces are where people who “want to buy at a bargain” gather, while proprietary sites are where people who “want to buy from this brand” gather.

Customers on a brand’s own website seek value beyond price, such as the brand’s worldview and the attention to detail in its products. If you can provide the right information and a sense of security, you can achieve higher purchase rates than on a shopping mall, but the biggest hurdle is not attracting traffic—it’s overcoming the “barrier of trust.”

2. Four Concerns Held by Customers of Brand-Owned E-Commerce Sites

① “Is this product really okay?” — Concerns About Product Quality

In fact, according to a survey by Cross Marketing, the top reason for checking reviews was “I want to know the information so I don’t regret it later (55.4%).” Consumers cannot feel reassured by the company’s explanations alone; they seek the “real voices” of people who have actually purchased the product.

② “Can I trust this store?” — Concerns about the shop’s credibility

Due to the rise in fake e-commerce sites, approximately 80% of consumers feel uneasy. “No reviews, or only a few (37.6%)” was cited as a factor in assessing trustworthiness, and reviews or user posts on the site (checked by 62.4%) are relied upon most to alleviate these concerns.

③ “What do other people think?” — The desire for social proof

According to a survey by the Consumer Affairs Agency, “using reviews and ratings as a basis for decision-making” ranks highest at 84.6% as a factor in purchasing decisions. Checking reviews has become a “standard part of the purchasing process.”

④ “Will this product suit me?” — Anxiety about personal fit

There is a need to know how people with similar conditions (skin type, body type, intended use) felt about a product. With U-KOMI’s “Custom Questions” feature, you can pinpoint and resolve this deep-seated anxiety.

3. Why Reviews Are So Important (SEO & LLMO/GEO Strategies)

According to Cross Prop Works’ “Survey on E-Commerce Usage (April 2025),” 76.8% of consumers refer to reviews when making e-commerce purchases. Furthermore, 44.9% of consumers visit sites “solely to read reviews.”

Reviews are not merely a nudge; they are the "very reason people visit a site." Furthermore, by 2026, as AI search (GEO) becomes widespread, reviews will serve as "reliable primary information" when AI recommends products, directly influencing search rankings and AI responses.

4. “I get that reviews are important. But I can’t seem to collect them…”

Reviews won’t accumulate on their own. To systematize the collection process, the following three points are essential:

• Timing: Request reviews immediately after the product arrives—during that “peak satisfaction moment.” Automated reminders are also effective.
• Channel: For younger demographics, requesting reviews via LINE is far more effective than email. Including QR codes on product packaging is also effective.
• Incentives: Encourage submissions through rewards like points. However, maintaining a “rating doesn’t matter” stance preserves credibility.

5. Negative Reviews Are Not “Enemies” but “Allies”

A site with only positive reviews is suspected of being "fake." Including a moderate number of negative reviews actually increases overall credibility. Consumers want to know the "honest pros and cons," not perfection.

Sincere responses give new customers the impression that your shop is trustworthy, and dissatisfied feedback serves as valuable input for product improvement.

6. With U-KOMI, you can build a system where reviews “gather and come to life”

U-KOMI is an infrastructure designed to maximize the power of reviews, compatible with major shopping cart platforms (MakeShop, Shopify, etc.).

• Automated Collection: Maximize response rates by freely customizing delivery timings and automatically sending reminder emails.
• AI-Driven Efficiency: U-KOMI AI understands the content and automatically generates appropriate replies. It can also automatically analyze sentiment trends.
• Visual UGC: Automatically collects UGC from social media (Instagram, etc.). Conveys the true nature of products through video reviews.
• Improved Customer Acquisition: Integrates with Google PLA (Shopping Ads) to display star ratings in search results and boost click-through rates.

7. Reviews Are an “Asset,” Not a “Cost” — The Impact in Numbers

"How much does CVR (conversion rate) change with the introduction of reviews?" According to research by Northwestern University’s Medill Spiegel Research Center, it has been proven that the purchase rate for products displaying reviews can increase by up to 270% (approximately 3.7 times).

Key Findings of the Study
: ・The first five reviews have the most dramatic impact on CVR
・The higher the product price, the greater the value
provided by reviews
in terms of "peace of mind" (CVR improvement rate) ・Star ratings between "4.0–4.7" sell the best (5.0 is viewed with suspicion) ・U-KOMI’s standard "Verified Purchase" badge can further boost trust (+15%)

8. Get Started Today! First Steps for Review Strategies

1. Assess the current situation: Identify product pages with zero reviews and prioritize collecting five reviews.
2. Implement the system: Use tools like U-KOMI to set up automated review requests at the optimal timing after purchase.
3. Layout Optimization: Display star ratings near the top of the page to immediately instill a sense of trust.
4. Leverage visuals: Transform product pages into spaces that make customers "want to buy just by looking" through photo reviews and other visual elements.

9. Summary: The Fastest Route to Overcoming the "Trust Barrier" on Your Own E-Commerce Site

The most effective way to overcome the "trust barrier" that determines sales on your own e-commerce site is through authentic reviews from actual buyers. Reviews are now an essential part of your infrastructure. Why not maximize the power of reviews with U-KOMI?

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* References & Data Sources

・ExCrie: Survey on Online Shopping Behavior (2025)
・Cross Prop Works: Survey on E-Commerce Usage (April 2025)
・VENECT: Survey on Consumers’ Actual E-Commerce Usage 2024・Association
for the Promotion of Personal Information Security in Small and Medium Enterprises: Survey on Security When Using E-Commerce Sites・Consumer Affairs Agency
: FY2022 Basic Survey
on Consumer Awareness・Cross Marketing: Survey
on Actual Word-of-Mouth Usage・Northwestern University: How Online Reviews Influence Sales