[louisadekoya]

I am not a big fan of advertising-only business models but I think this is one idea that would be better off relying on ads than on paying users. To be frank, I just don't think that users will pay for answers. They will exhaust other avenues first and even then most won't be able to bring themselves to pay.

As I explained in a recent blog post (http://www.ideatagging.com/a-facebook-and-yahoo-partnership-...), after search, questions are the next best thing for detecting users' intent and therefore are a good basis for tageted ads. So my advice, much as it pains me to say it, is to ditch the paying users idea and instead focus on ad revenues.

By the way, I have some interesting angles on the whole questions and answers thing. Contact me via my blog (link above) and I would be happy to share. Good luck.