How come none of them offer you an option to download a game for a limited time? Like a rental for a week, then the game deletes from your console?

Surely people would be happy to pay £10 or whatever to download something they know full well they'll only play for a week then never play it again? Where as they're choosing to not buy it as it's £50 and they know they won't play it that much to justify spending full whack for it.

Thoughts?