It takes a lot of effort to keep multiple projects in the air. Even something that "runs itself" never really does. I've got Draft going while I work on Highrise, and Draft works very well on its own, but I still have to deal with support requests, downtime, upgrades, refunds, and more.
The guy wants to focus on his other projects. Patrick's never hidden the fact that selling Bingo Cards isn't as lucrative as his other projects. He's super honest and open about what goes down. https://www.bingocardcreator.com/stats Tons of good lessons he's learned that he's now applied to other business via consulting, Appointment Reminder, and now at Starfighter (http://www.kalzumeus.com/2015/03/09/announcing-starfighter/)
Look at 37signals. They decided they needed to focus on Basecamp to make it as good as they want. http://37signals.com/
We all should be shedding more and more stuff in our lives to focus on the bits we want to grow and see further through. Nothing at all wrong about that.