8 bucks is not overpriced for a serious work app.
I also tried convincing the developer several times that it was overpriced but no luck.
and in the long run he is correct.
He perceived Android as a serious system for productive work, not a mere consumer-toy platform.
however the reality is that "high quality apps" are overall decreasing in price, and you're quite likely to see stuff like Maya offered with a free noncommercial licence in the near future (because other autodesk products are already moving in this direction).
Clover Paint is aim for the professional and he does not want to set a lower the price since it would put a hindrance on the advent of other high quality apps.
he's charging 8$. that's definitely reasonable. with or without the added ideology.
The majority of developers, unless the few lucky ones with a big hit, could not make a living out of developing for mobile platform (Android, iOS etc) alone because of the fierce pricing competition. He doesn't want to put up with that, and wants to change the situation in the long run. Quite overconfident and unrealistic goal with sole effort from an individual if you ask me.
The heights by great men reached and kept,
Were not attained by sudden flight,
For they, while they companions slept,
Were toiling upwards in the night"