I guess I've always been of the understanding that mobile software works on the basis of 'buy once. upgrades free', and for the most part I think that developers have that in their heads too.
I'm interested to know how many music application developers would like to utilise Apple's in app purchase mechanism for next features and functionality? I'm not just talking about paying for plug ins, but also for additional capabilities for an app, say for example expanding the available tracks in a multi-track recorder.
Is this what's in store from developers, and if it is, are we users ok with that?