[lethargus]

"Both platforms are much more open and on a mac you have very little trouble with stability or malware or even quality. "

I believe there are other factors that can contribute to this. I think the laptop/desktop portion of Apple still attracts a certain individual that typically requires things to be well designed and stable. Unfortunately the cell phone market is not the same way, especially when you factor in free or extremely cheap applications compared to more expensive OS X counterparts. The iPhone appealed to a wider audience, including Windows users who arguably put up with a lot crappier inefficient software.

I think when originally putting the app store in place, it was a fear to have this crap trickle into the Apple app store.

Also, Apple has a vested interest in the success of applications in the app store whereas it doesn't have as much direct benefit from applications released and sold independently for OS X.