Working on FairScan or getting a "real job"?

I've been working actively on FairScan for almost a year now. Why do I spend my time working on an open source project rather than getting a "real job"? What drives me? To explain that, I have to write about myself, much more than I did so far in this blog. That feels a bit uncomfortable but it can help convey what I'm trying to achieve. Over the last 25 years, I had several jobs as a software…