Banning boosters isn't IW's top priority as you can tell from MW2. They will ban boosters from time to time (usually those who have broken the offence more than once or have taken boosting to extreme measurements) but no promises to banning a "wave" of them.
I would agree with you guys except, IW has show signs of banning people who boost on Kills Leaderboards.It seems like they have policed and kept them pretty much legit. There were ban waves where they banned all the big time boosters who boosted kills.
Originally posted by storm
Usually boosting is only a 3 day ban and a reset for a first offence. Treyarch was ban-happy with Black Ops and many people wern't happy with that. Maybe IW doesn't want to take the same path?
I don't think that banning the biggest boosters on the game would make them ban-happy.