[twobyfour]

I would suggest that the problem is that the app stores don't properly support the free trial model.

I won't spend $10 on an app sight unseen because if it's crap or even just plain doesn't do what I need, there's no way to know that aside from trying to parse it out of the reviews that the developer probably bought from a spammer.

I will spend $10 in a heartbeat on an app that I've tried for two weeks and don't want to go back to living or working without.

But AFAICT, Apple explicitly forbids that business model in its store. Dunno whether or why Google Play apps don't use it more, tho.

[detaro]

Google Play also doesn't really have a good way of implementing that as far as I know. You can do free app and unlock via IAP, but no matter how clearly you spell it out on the page people will not read it and kill your ratings with "1-star, SCAM!" reviews.

Something like this really should be a store-level feature