At a very early stage startup, being a late founder means $50k cash salary (I get $30k as a founder, and if we did a late founder, I'd push for the same salary) vs. $100k+ for employee #1, but huge equity (5-50% instead of 0.5-5%, depending on person, size of team, how late, etc.). If you don't view founder-level equity as being worth $50-100k less cash comp, you probably shouldn't work there.