I mean hell, you could be part of the magic sauce that helps a new startup grow into something really promising, but until the higher-ups recognize you and truly respect you, you'll probably just get shoved aside at some point, because politics or whatever other change happens during the growth. And the only thing that reflects respect is 1. a meaningful equity percentage and 2. guarantee that you won't be forced to give up the stake because of some exercise deadline after you leave.