Difference is, in retail if I want to get my product to the masses I'm not locked in to selling in or two on particular retail stores.

Your comment shows the glaringly obvious problem. We don't need two monopolized appstores to "decide" how much of a cut should go to appstore maintainers for all the (real) work they do. Opening u the ecosystem for more appstores or more venues to get apps will keep the prices to a market-driven norm as opposed to a monopolized fixed percentage.