So Yelp puts businesses up for public criticism and simultaneously try to sell advertising to those same businesses.. that puts them in a tricky spot of trying

So Yelp puts businesses up for public criticism and simultaneously try to sell advertising to those same businesses.. that puts them in a tricky spot of trying to stay fair and still make money. The local advertising market is hot, but maybe they should be exploring other revenue ideas if they want to keep from descending to Citysearch's depths of mistrust - licensing the data they collect (like InfoUSA), data mining (like Macrosense), maybe even selling a product?