Horseshit. You're welcome to hire that way, but I can tell you right now, you're missing a whole class of excellent devs that put 100% of their time into the stuff they're working on at the office. I have side projects I occasionally work on, for myself, but they're not on a public github, and they're almost always when things at the office have slowed down a bit. The rest of the time, I enjoy what I do so much, that I spend it on the work tasks, trying new PoC's, refactoring, etc. Now tell me exactly why you'd not hire someone like me?