If you can have fun with that kind of one-trick pony and never want anything bigger & better, kudos for you. There's a reason why it's only 1$ and something like Wipeout 2048 is 30$. I'd gladly take Wipeout over iPhone games every time.
I'm not going to argue against Jetpack Joyride, because the game is pretty sweet. However there really isn't much to the game at all when you really break it down. The genius in the title is the developers ability to use achievements alongside unlockables as a treadmill to keep you coming back.
There is also nothing stopping Jetpack Joyride from showing up on Vita for a buck or two if the developers wanted to do so. Vita can do everything ios hardware can do and more.