passerinelabs
For some developers the MAS is a really nice alternative to direct distribution. You don't have to setup a merchant account and deal with all that. Your apps are automatically searchable (if not really discoverable). You have a built-in review/rating system to establish credibility pretty quickly (which absolutely impacts sales). It's not a horrible system, and again, Apple doesn't force you to use it... unless you want to use iCloud, but then again there's nothing stopping you from doing your own cloud sync solution as Omni has done.
The MAS is just another sales channel and Apple doesn't force you to use it. It's not incumbent on them to add features just because some people want them.
I'm happy to hear any feedback: andrew at passerinelabs.com or @passerinelabs on Twitter.
Here it is: http://appstore.com/mac/ScreenshotTimelapse
Here are 25 promo codes if anyone wants to try it out: http://pastebin.com/K6Xx59jY