That’s a false dichotomy, because an ice cream parlor doesn’t stop selling ice cream when they give out free samples, any more than most open source developers quit their jobs (or stop searching for one) to work on their personal projects. Plus, you’re kind of asking the wrong person anyways, because I think I actually do significantly more work for free than I do for what I get paid for, just for those warm fuzzy feelings (exposure being a nice bonus). Plus, I happen to be financially stable enough to probably do this for longer than six months if required even without a full-time job. I basically did this last year when switching jobs (actually around five months, while interviewing around at a leisurely pace) and it was incredibly enjoyable. Felt like I had retired early and could just pursue whatever I wanted to learn or make: if you can afford to do it, I’d strongly suggest giving it a try.