Make an RPG with arbitrary skills that level for menial tasks such as moving, looking at certain objects and something more obscure like standing in a designated area. For every so much experience gained in a skill, you gain currency to which you can spend on a plethora of collectible hats. In every area in the build you should have a glowing red scene reminding the players just how integral hats are to the RPG.
Once the dedicated players with the higher-class hats show their face, force them into extreme challenges to test their persistence. Slowly but surely you will single out the community down to a group of champions, and have them duel each other in a deathmatch. The single victor then gets the choice to continue collecting hats, or the choice to press a blue button that shuts down the server permanently.
Poll