Happier customers -- at least me, especially since it's a selling point for them.
I actually disagree it's easier to boot up and play a game on my iPhone/iPad being easier than doing it on my Mac. The one game app that I've played that does allow a Mac to run it is quicker to load and just as easy to play with a mouse vs. touch input.
A mouse works just as good as single touch input, and that's what most apps use. Multi-touch would be a problem, but I have no multitouch apps on my iPhone.
Maybe not this time around, but there's a good saying about the consequences for customers, once bitten twice shy.
The iPhone isn't my preferred platform for sitting and playing light games, a WindowsPC, or one of my Mac's are. I don't do AAA games at all on any Apple platform. (or Windows for that matter) Input is a problem there too, and much more of one than single touch!
Me! (But not just games, other apps as well)