I know, but that doen't mean to say they won't do it.
Is it a coincedence that hats appeared in TF2 around the same time that Battlefield Heros came out of beta?
I know that Valve are great at supporting their games and that they do more for the PC than anyone else. But they are a business and they have to make money to continue in business.
It wouldn't bother me if the introduced a micro payments system for custom clothing, you would still have a choice as to whether or not you parted with any cash.
True, I can't rememeber how much I paid for TF2 but the value I've gotten out of that game is astounding. I feels a bit wrong how much free goodness I still get out of it.