The way I see it, this is great. Start up success means you get to live a lifetime of working in X many years instead of Y like everyone outside of tech, where Y >> X. You have the freedom to direct that energy towards family, yourself, and charity when you want to call it quits. Most people don't get that luxury. You also have the freedom to look back at a short, but intense career of (hopefully) successful products that you were a core part of. Even fewer get to experience that.