The best fuckin way to get xp in halo 3 on double xp weekend. Get someone who doesnt mind quitting and have him sign in 3 guest controllers as well. Then get 3 others who want xp. Now have the guy with 4 controllers quit so u win every time and join back up. Estimated 100 xp in 30 minutes.
MAKE SURE THAT EVERYONE'S STATUS IS SET TO OFFLINE then you wont get banned.
Me. I have 8000 xp (5 star general) from boosting in grifball and ive never been banned.