Honestly, if you 'incentivise' someone to post on a community site (whether via money, exchanges or free stuff in general), the quality of their work will usually be terrible. What do you expect when you ask non experts to post reams of topics about things they haven't got the slightest clue about?

I always wonder who's doing that and why. Quora does pay people to write questions, but the pay is supposed to be tied somehow to the quality of the answers. Maybe it's more a quantity thing, as dozens of people jump in to give answers to the basic arithmetic questions in my feed.

Im curious, can you give an example?