I think Angie's follows up on reviews and verifies. I have had calls and emails from them after posting reviews. That would set that site apart from Yelp.
Amazon.com loses money, too, yet investors still pour money into it. It must be some sort of fraud thing where people recoup their money while the company 'loses' money. http://www.slate.com/blogs/moneybox/2013/07/25/amazon_sells_more_than_ever_loses_money.html Bezos is allowed to run this scam and monopolize the online marketplace because he invests heavily in socially liberal causes and fiscally conservative economics. Investors will keep propping up the company in venture and stocks because the idea is to eventually be the only online retailer out there. Amazon is now in the B to B commercial sale business, and is operating it at a huge loss, yet is eating up smaller companies that are brick and mortar.