Ah. See, I don't fully agree with that policy either (the "exclusive demo" for buying before trying). Sort of putting the cart before the horse.
Are you sure? I could have sworn I downloaded the demo first and then paid for the game.
Either way, I'm still pretty much of the belief that demos are straight marketing material; I don't see the point in the "sneak preview" approach unless Valve is really dedicated to rewarding their supporters who buy their stuff without even trying it first.







