I run https://www.soundslice.com/ with one other full-time person. We're self-funded and make a profit at this point.

Soundslice is interactive sheet music synced with audio/video recordings — the Internet's best software for learning pieces of music.

We make money by licensing the technology, taking a cut of lessons in a video-lesson marketplace, plus charging $20/month for a "pro" version (Soundslice For Teachers).

We're happily bootstrapped and located comfortably far from the La La Land of Silicon Valley. (I moved from Chicago to Amsterdam a year ago, and my partner is in Chicago.)

In fact, being able to tell potential customers/partners that we're not a "conventional" startup (one that just wants to sell out to give its investors a return) has been an unexpected benefit. The story resonates with people, and it's good for building trust.