@Th3G4m3r TB was extremely underpriced. Intentionally because of how bad the public API was. Moving Tweetbot over to work with Ivory was no easy task. It's taken us 3-4 months of working 12-14 hour days just to get to this point and we still have years of hard work ahead of us to get the app where we want it to be.
$15 a year is not a lot of money for quality software that you use everyday. If a user thinks it's too expensive, then they don't see the value of the work we do and that's fine.
@ivory
15€ might still be OK but in Europe it's 18€. Bear this in mind. Then adjust the price so that it is approximately the same for everyone, despite the conversion.
From 7€ to 18€ is simply much too high.