> If they would introduce a paid service that lets me have the exact same site, but without ads, I would sign up in a second. And then do that and then suddenl

> If they would introduce a paid service that lets me have the exact same site, but without ads, I would sign up in a second. And then do that and then suddenly users think it's not worth the money for reason X and they tank. It has happened many times before and few companies can pull that off when their products were established as free.