It has been my experience that some founders can jump directly to a seed or A round without spending all that much time unemployed--or any time unemployed. This means they can draw a salary from day one. In this scenario I don't see a lot of personal risk on the founders' part--and, indeed, if they're able to get this level of funding, they can likely talk their way into a higher level at BigCompany even if the company goes belly up, netting a pay raise even in the failure case.