Under the “Why does Yelp discourage businesses from asking for reviews?” section, it says:
1. Would-be customers might not trust you. Let’s face it, most business owners are only going to ask for reviews from their happy customers, not the unhappy ones. Over time, these self-selected reviews create bias in the business listing — a bias that savvy consumers can smell from a mile away. No business is perfect, and it’s impossible to please 100% of your customers 100% of the time.
2. Solicited reviews are less likely to be recommended by our automated software, and that will drive you crazy. Why aren’t these reviews recommended? Well, we have the unfortunate task of trying to help our users distinguish between real and fake reviews, and while we think we do a pretty good job at it with our fancy computer algorithms, the harsh reality is that solicited reviews often fall somewhere in between. Imagine, for example, the business owner who “asks” for a review by sticking a laptop in front of a customer and smilingly invites her to write a review while he looks over her shoulder. We don’t need these kinds of reviews, so it shouldn’t be a surprise when they aren’t recommended.