Rewards for authors who follow up their instructables Answered
Nearly every instructable I find interesting has dozens of questions at the bottom unanswered. Some of them are inane silly questions like "how much does this cost?" but others are quite often asking for help in finishing the instructable.
It's difficult to enforce follow up on posts, but you could offer rewards in some way, even if it were a simple thumbs up/vote count system or something similar.