My two cents.
Any kind of sponsor is going to want to see a return on any money they invest in advertising on your site. For that you need traffic, and for traffic you need content, forums, a compelling reason for people to visit your site. Content that keeps on changing. It takes a lot of work. A simple developer's Q&A may not be sufficient to attract any great number of viewers...especially because there are a ton of resources out there to support developers - Ars, Anandech, Sharky, blah blah blah etc. And, of course, there is always Google. Moreover, answering a single person's question is very unlikely to attract people, because odds are the only person interested in what that particular person has asked is that same person.
You might just try Google Adwords if you are trying to cover hosting costs. Just my two cents. Good luck!