The problem is most games on these systems are terrible, and often either don't have a demo, and want to ckle and dime me to be able to make progress through the game.
On the other hand, while I might not like all the games on the Xbox online store, I find them to be of reasonable quality, have demos, and never require me to pay to make progress through the standard game.
I have found several friends have had a similar experience. Perhaps we are just dinosaurs, but I wonder if games on mobile are going to crash (or have already crashed, how many are selling any kinds of numbers? obviously some do well).