Well, the money must not be crap, but I have also seen what gets people going is a vision and a mission! Not the kind that so many corporates seem to think will enthuse their staff, with a lot of big talk and useless positive speech while disregarding the real issues on the ground, but something that is actually 'owned' by the team, and they can contribute to. Improving the world, in whatever way, is a great motivator! Show me a developer that doesn't care whether their software is ever used, or making the world a little bit better, as long as they get paid for it, and I'll show you regrets looking back in 20 or 30 years time.