You can give your players incentive to do things, but if it’s not the incentive they’re looking for they will probably demonstrate it by their in game actions. Some examples of player incentives include:
A programming project where I set out to make a gigantic and complex world from simple data.
Why I Hated Resident Evil 4
Ever wonder how seemingly sane people can hate popular games? It can happen!
This is Why We Can’t Have Short Criticism
Here's how this site grew from short essays to novel-length quasi-analytical retrospectives.
Punishing The Internet for Sharing
Why make millions on your video game when you could be making HUNDREDS on frivolous copyright claims?
Artless in Alderaan
People were so worried about the boring gameplay of The Old Republic they overlooked just how boring and amateur the art is.