If you look at the selection of apps on the Mac App Store, where developers aren't forced to use the store, it's pretty easy to see that their 30% generally out

If you look at the selection of apps on the Mac App Store, where developers aren't forced to use the store, it's pretty easy to see that their 30% generally outweighs the usefulness of the service. So, semantic discussions of monopoly aside, Apple is charging a rent. In general, we should be against rent-seeking in technology.