I really like the site, and it is well executed. I think I'll certainly use it at some point. Good price point.
I completely agree that there needs to be some way to restrict who answers questions.
Another example would be if someone was making a Twitter application, they might want to restrict people who answer the question to only those that use twitter.
Or if you were doing something aimed at webmasters, you might want to restrict the responses to people employed as such.
As also mentioned in other comments, use your poll system to do your own poll on how desirable this could be.
I completely agree that there needs to be some way to restrict who answers questions.
Another example would be if someone was making a Twitter application, they might want to restrict people who answer the question to only those that use twitter.
Or if you were doing something aimed at webmasters, you might want to restrict the responses to people employed as such.
As also mentioned in other comments, use your poll system to do your own poll on how desirable this could be.