Well, I don't want to pull the kernel-hacker card, but it sounds like you might not have experienced being yelled at by Linus during a kernel summit. It's not fun and not worth the money. Also it's well-known that LF can't compete with e.g. Collabora or Red Hat on salary, so the only folks who stick around and focus on Linux infrastructure for the sake of Linux are bureaucrats, in the sense of Pournelle's Iron Law of Bureaucracy.