Blah Blah Blah! The unlocking of the iPhone was more for the international market then for AT&T. Apple only gets subsidy from AT&T as long as the phone is on an open AT&T account. AT&T has nothing to lose if people unlock their phone.. and use *cough* tmobile. Especially since tmobile is just about the worst cellphone carrier in the US. You would effectively have a handset you paid good money for which only has about 1/3 of it's functions working and you can't even update it.
The international carriers have alot more to lose on unlocked iPhones since with the US dollar at an alltime low it would be cheaper to get a hacked US iphone then it would be to get one from the authorized carrier overseas..
Or perhaps the person who wrote this likes only making phone calls in 1/10th of the US.