I think OP is confusing not charging for your app from day one with good testing with your customers. If the ultimate plan is to charge for the app, and you wa

I think OP is confusing not charging for your app from day one with good testing with your customers. If the ultimate plan is to charge for the app, and you warn your users that you'll be doing that yes, you'll be getting some free feedback. You should have been doing this way earlier anyway, and probably could've saved yourself some time by releasing smaller bits earlier and often...er. Not only that, as igrekel already pointed out, all the feedback you DO get has to be taken with a grain of salt.