I think yelp was actually sued by a furniture company in San Francisco. They had great reviews and when they didn't pay for the advertisement or endorsement, yelp went an deleted all their positive reviews. The furniture store said that previously customer were coming based on reviews and then they stopped cause the bad ones showed up. And this was for several businesses. I forgot what was the outcome though?
CS is definitely a gamble with stores. I've had some pretty bad Tiffany store experiences and I think what SK said about the population there definitely affects it. The "old money" stores versus big urban city stores in tourist areas have different feels with them.
The worst was with my most recent LV purchase, I asked what was the exchange or return policy in case I wanted to bring it home and show DF. If he didn't approve I would exchange it. The girl straight up told me "then maybe you shouldn't buy it"... WTF! I was so mad and I actually had to complain and I never do in all other situations. I did keep the purse because DF liked it for me but still just knowing I gave her commission left a bad taste in my mouth. Whereas with some sales people I will let them sell me anything and I'd happily give them my commission and then some!
Yeah, Yelp was extorting money from mainly small businesses in exchange for keeping positive reviews on the site. I don't think they deleted the positive reviews - just buried them below/among the negative so the first thing yelpers would see would be the 1-2 star reviews.