A few quick notes ...
1. Credit card processing is expensive. Many Mac shareware developers use payment processing services like Kagi or Digital River that take 15-20 percent off the top anyway. Billing simplification and an easy to use payment systems (Apple ID) could be worth the extra 10 percent alone.
2. Apple's promotional marketing will be stellar. Besides the normal curated featured apps within the Mac Store you can expect future Web/Print/TV Mac ads that showoff Mac App Store applications --- "There's a [Mac] App for that.". If you're lucky enough to get featured, you'll be rolling in the dough.
3. Universal updates and push notifications are a huge benefit.
The major issues Apple needs to address with both the iOS and Mac App Store is 1) upgrades (or the lack there of) and 2) trial downloads. Hopefully, that's coming soon enough.
It's an exciting time for the Mac. Sales continue to climb, a new OS is coming and now it's getting an App Store. Glad to see Apple still cares about the "trucks."
The next App Store needs to be the Apple TV App Store (which Jobs pretty much confirmed they were going to do). I hope they're staffing up appropriately.
www.businessweek.com/magazine/content/10_37/b4194030216774.htm&t=1288782759