[jandrese]

To boil it down: Valve doesn't pay anybody to make their content available exclusively on Steam and doesn't advertise "exclusives". People did that for free.

IMHO, exclusives are obnoxious and I'm glad Steam doesn't do that. The physical retail market is full of crap like that, or pre-order bonuses that are tied to particular retailers. All of that garbage is a cancer on the gaming market.