But I have a very simple rule: Either I'm a cofounder, or I'm a freelancer[1]. If I really really like your idea, I will lower my rate.
When you do the calculations, by the time there is an exit event even starting with 30% equity is barely worth it considering the exit size of most startups. For 1% equity ... few things under a google-sized exit will make you well off, most wont even come up to getting a market-rate salary.
[1] I actually specialize in freelancing for startups and small businesses.