There's a bit of a chicken and egg problem here: If app.net was already well established among users then it'd be great to tap into that userbase, and users would be looking for more apps. Unfortunately, before that happens it's pretty hard to imagine that an app developer would be able or want to introduce their users to both 1) their app, and 2) that they need to pay for a separate service in addition. Sounds like it'd be complicated and confusing to users. Perhaps if alpha.app.net were to take off that would solve the problem, but since they're focusing on a platform and not the app, that doesn't seem as likely.
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There's a bit of a chicken and egg problem here: If app.net was already well established among users then it'd be great to tap into that userbase, and users would be looking for more apps. Unfortunately, before that happens it's pretty hard to imagine that an app developer would be able or want to introduce their users to both 1) their app, and 2) that they need to pay for a separate service in addition. Sounds like it'd be complicated and confusing to users. Perhaps if alpha.app.net were to take off that would solve the problem, but since they're focusing on a platform and not the app, that doesn't seem as likely.