If you work for a startup and reject variable comp, you are wasting your time. Go get a safer, easier, better-salaried position.
If you aren’t working for a startup, you’re in no position to comment on the validity of the approach people take there working with variable comp.
You just walked into a funeral for people who got hit by a train and said “what’s the big deal? I never cross train tracks, they’re too risky.”