Besides thrashing the internet with crappy robot written text to game the search engines, I don't think there's a money making venture. I'm hoping someone proves me wrong. Because it seems like there should be. The biggest issue is that you can't trust the results so it's easier to just use Google. I suspect that relatively soon the web will be full of crappy data so the search engines will be even less reliable. So, even the search engine reliability option is disappearing.