I run one, a minimalist personal finance app. It's about 11 years old at this point. I built it up as my full-time gig and ran it initially for about six years. At that point: A) I had hired someone part-time to do customer support; B) the feature set was stable enough that it didn't need constant attention; C) I was missing working with people. So I moved out to SF and started working with a startup as an engineer.…
Do you have a link to your product? A cursory search turned up nothing.
We're closed to new signups now while we wrap up the last bit of feature parity from the old app (and make sure all is working smoothly for our current subscribers), but would love to have you check it out in a little bit: https://pearbudget.com