so a 10% markup on everything, which people have to circumvent by intentionally trying to play the game at the same time just in order to get the 'discount'?
Because Steam sales have driven the prices of games up by 50%. Oh wait, no, AAA games are still $60, but now Steam offers them at a reasonable discount after a few months to undercut the used-games market.
Getting kicked out is a point of friction, where a user could either start torrenting, or buy the game legitimately. If they can prove that a small discount improves conversions, I don't see why they wouldn't offer it. Steam is all about removing friction by offering discounts.