They bank it as any insurance company should do. Invest it cautiously. Hire sound decent people to run it with solid levels of accountability (including from a board of directors that is mostly made up of a rotating number of clients). Do it from the beginning of the company. Grow your staff slowly. Build enough of a cushion that can last the company years. Right? Right?

I'd run that company well for $250k/annually + benefits (an enormous amount of money).