Why digital sales and not digital rentals, because that's really what is it for the most part. If I don't own a physical copy of a game I feel I'm renting it. I can go to a video store and rent a new console title for 10 bucks for an entire week. Maybe if they translated the production cost savings into lower prices - you know, like they always said they would - and new games were only $20 or $30 to begin with than they'd have my attention, otherwise, no thanks.
"I like my coffee like I like my women. Black, with a side of prune danish." - Gilbert Gottfried