This is something that I've just experienced on another forum. Put simply, someone thanked me for my post, as they found it highly valuable, and awarded me a "monetary reward". This means, instead of just a "thanks" that they send me some money to my Paypal account.
I just add my paypal account under my profile settings, and if other members find my input useful they reward me for it.
This could work here, and would probably improve the quality of the responses.