No problem John, I'm not (yet, at least) a user of your app I'm just a fellow indie that wanted to illustrate the reality of doing business at just $30/copy. Prices are low enough to make most indie development uneconomical in pure dollar terms. Though I wholeheartedly agree that money is not the only motivation, customers need to realise that developers need to make a decent living in order for there to be a vibrant ecosystem of apps.
As an indie who has made the mistake of both pricing too low and spending too much time on development (vs marketing) in the past, it looks like you've done very well to avoid these pitfalls so far!
one of the biggest compliments and encouragements that i've received is that other indie developers have told me that i've done it "right" by pricing the app the way I've done it.
in fact, many of them have shared with me that they've done this wrong in the past and that they wanted to encourage me that i've gotten at least this part right!
the challenge is that those "atta boys!" are all private via DMs or individual emails... not public so they aren't available for all to see.
but to be sure, i've got a bunch and it feels great.
As an indie who has made the mistake of both pricing too low and spending too much time on development (vs marketing) in the past, it looks like you've done very well to avoid these pitfalls so far!