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:
Game at the Bottom
Why spend millions on visuals that are just a distraction from the REAL game of hotbar-watching?
Project Button Masher
I teach myself music composition by imitating the style of various videogame soundtracks. How did it turn out? Listen for yourself.
PC Hardware is Toast
This is why shopping for graphics cards is so stupid and miserable.
Crysis 2 has basically the same plot as Half-Life 2. So why is one a classic and the other simply obnoxious and tiresome?
Fixing Match 3
For one of the most popular casual games in existence, Match 3 is actually really broken. Until one developer fixed it.