(adsbygoogle = window.adsbygoogle || []).push({}); Before this exploit, Treyarch had a "boosting" detectable system in place. This meaning if you where going 80 k.d every game/ un-realistic scores it would automatically set off an alarm, not literually but the system would tally your name down. I guess if your name was tally'd repeatedly you'd get banned (just like the reporting system).
It's just a theory, but Treyarch said they had a detectable system.

-Stevo

i got 150 killstreak and got banned straight away ( and reset )