If a reply/thread is helpful, we should thank the poster, so I thought a thumbs-up and thumbs-down system would be helpful. If you think the post is helpful, you can thumb it up! If it's not helpful, thumb it down.

Maybe the poster should get some money if their post is really helpful to the community (E.G: a tutorial hit 20 thumbs-up, they get a reward :D) but if there's too many thumbs down ... The post get reported.