Not sure that's iron-clad true - I doubt patio11 "loved working on" Bingo cards or appointment reminders, and I'm reasonably sure neither were problems he was trying to solve for himself.
Better ask him, but I suspect he did enjoy it to some extend. I doubt he did it only as a money grab, but rather because of some interest in the problem. Maybe not the domain of bingo cards itself for too long, but everything else that comes with that: writing, explaining the product to teachers, SEO, marketing, customer support, automating everything.
There were probably higher-productivity ways to get money than writing bingo card creation software for elementary schoolteachers. To put it mildly.
I didn't have "an itch" for either problem myself but I did really, really love throwing myself into learning how to run a business. BCC felt like a relatively low-risk way to do that. (AR didn't ever feel particularly low-risk -- and the stresses implied by that are one reason why I'm glad I don't run it anymore -- but that is neither here nor there.)
