Do you have a blog or something where you talk how to get started? I think many of us want exactly this but haven't been able to pull it off yet. At least that's my case. I have about $30/mo passive income but it would take an awful lot of those to gain any flexibility!
This is with a SaaS app designed from the outset to minimize support and maintenance, with profit also a high priority, provided it doesn't conflict with the first. It was in no way hard to do this. I often recommend that others give it a try.