What you're trying to solve is a form of social validation and trust that brick and mortar stores implicitly have: 1. They have to have spent a reasonable amount of money to actually be there; 2. A busy store with lots of people at the registers means there's enough trust to spend money here.

To solve this in a virtual environment you'd need a comparable amount of implicit trust. For #1 it's doable: have a trustworthy domain name. Amazon.com is a lot more trustworthy than look-at-my-shop.tk. For #2 I don't think there's a trustworthy equivalent, since it's either off-site by a third party or unverifiable by users.