10-15% less salary does not equal "several magnitudes" more risk. To my mind, for a funded company, the risk is the same for founders and employees. The worst that can happen for both is unemployment.
First, you're ignoring all the risk a founder has already taken just to get to a funded state.
Second, many times(always?) a founder has personal savings wrapped up in the company.
Third, an employee can always just quit and find a new job. The founder is much more tightly bound to his/her company because of obligations to investors, other employees, clients, etc. To say that "the worst case scenario" for both is unemployment is true, but you're ignoring many other factors that make it far more likely for the founder to be stuck going down with the ship while employee walks away Scott free.
How many of those factors are purely emotional/psychological/imagined ones?
One trick to figure it out is to imagine founder being hit by bus: who will be hurt? Will family be hurt (besides losing the founder himself)? Employees? Clients? Investors? Anyone else?
Second, many times(always?) a founder has personal savings wrapped up in the company.
Third, an employee can always just quit and find a new job. The founder is much more tightly bound to his/her company because of obligations to investors, other employees, clients, etc. To say that "the worst case scenario" for both is unemployment is true, but you're ignoring many other factors that make it far more likely for the founder to be stuck going down with the ship while employee walks away Scott free.