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.
The current App Store pricing devalues software, it turns it into a disposable commodity to be purchased and discarded. Apple is willing to sacrifice it's own pro apps to this devalued future because that's not where it makes its money anyway and it has some major scar tissue from being held hostage by the likes of Microsoft and Adobe.
You can say it's just another distribution channel, but it's obvious that the App Store is the future, and is by far the most convenient and recommended channel and that will only increase over time. Comparing it to something that is easily provided by third-parties like analytics is to miss the fundamental connection: Omni makes the type of software that App Store pricing makes impossible to create and maintain over time. If this continues the ecosystem will dry up, and the type of pro users who love Omni's stuff will all disappear as well. It's a bitter pill to swallow because they love Apple's tech, but the writing may be on the wall.
Please. The wheretos and the whyfors of the negatives of Apple's particular flavor of walled garden have been discussed ad nauseum. You know damn well the problem here isn't that they don't have an upgrade pricing option, the problem is that they came down like a ton of bricks on someone for sidestepping the problem.
That very much is abusive, and "blah blah you have a choice" does not absolve Apple of criticism of this weak policy.
Apple does "force" you to use the MAS. You can't use the iCloud APIs unless your app is sold in the MAS which means you also have to accept sandboxing. Who knows what else will be tied to the MAS in the future.
The situation is farcical because developers are paying Apple 30% of their gross revenue for the privilege of a sales channel with no customer information and the spectacle of begging for things like upgrade pricing and analytics.
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.
What if they suddenly say only apps distributed in the MAS can use AirDrop, CoreData, CoreAnimation, etc.?
It's not as if they will bother telling developers beforehand.
Go look at the Apple developer forums today, under the iOS 7 beta section, people only found out that the iOS App Store allows older versions of apps to be downloaded because 9To5Mac found out about it and published a blog post. No official guidance (as yet) has been given to developers.
There is no slippery slope here.