The entire reason for the exclusivity is to drive sales of their hardware. If they need to sell 500 units of hardware or 5000 games to break even on a given in

The entire reason for the exclusivity is to drive sales of their hardware. If they need to sell 500 units of hardware or 5000 games to break even on a given investment, and selling that hardware also increases the odds that you'll purchase other exclusives from their store once you've sunk the cost, there's plenty of motivation to do it, even if you don't end up buying most of the exclusive games. (Note that I am not weighing in on the ethics of this, just remarking that there is a legitimate business reason to do it.)