I sold an app with good traction for $20k. Part of the reason was we hated the users. We built a diet community and that community was literally toxic - they'd encourage people to follow crazy diet approaches that would make them pass out and they'd group attack anyone who brought up medical evidence that this was a misinterpretation (including me, our suppliers & our dietitian).

The company that bought it got sick of the users within a few weeks but unfortunately their attempts to pivot and rebrand didn't work.