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 Star is Born
Remember the superhero MMO from 2009? Neither does anyone else. It was dumb. So dumb I was compelled to write this.
Final Fantasy X
A game about the ghost of an underwater football player who travels through time to save the world from a tick that controls kaiju satan. Really.
Project Button Masher
I teach myself music composition by imitating the style of various videogame soundtracks. How did it turn out? Listen for yourself.
Batman v. Superman Wasn't All Bad
It's not a good movie, but it was made with good intentions and if you look closely you can find a few interesting ideas.
Fixing Match 3
For one of the most popular casual games in existence, Match 3 is actually really broken. Until one developer fixed it.