I run a blog to book service (https://pixxibook.com) that while physical product, non-SaaS and firmly B2C has proved to be both low in support and reasonably profitable.
Sold our first book about a year ago and has grown steadily to the point where it could replace my day job. I've done blissfully little marketing beyond buying ads. Currently spend less than 1 day per week on it and during summer holidays I was able to keep it running from my phone with irregular connectivity.