Get paid (not very well) to play halo 4

The big money is 600 MS points for 140 hours that must be completed by Nov 30. For all you math majors out there, that is about 6 hours a day for the rest of the month.

and just for fun: 600 MS points = $7.50/140 hrs = $0.05/hr.

You also get points for buying stuff...

http://rewards.xbox.com/faq/#halo-4

joystiq article

http://www.joystiq.com/2012/11/07/play-halo-4-multiplayer-a-whole-lot-get-free-microsoft-points/