Gemini Flash is my go-to for many client projects, so there's at least a few people paying for it. If it fits your use case, it's easily the best value for money, and often makes something commercially viable that wouldn't otherwise be.

Sample size of 1, obviously, so YMMV.

I also pay for Claude Pro for personal coding use, so I'm aware that Flash isn't exactly a drop-in replacement for a more powerful model. From my limited testing, though, Pro 2.0 is almost indistinguishable from 3.5 Sonnet.