Mike,
Other than getting into technology manufacturing or certain high-end luxury goods retailing, an escort service can garner gross margins >= 50%! (I'd stay out of the former cuz it's capital and R&D intensive, and you have inventory risk with the latter).
Yes, just by being an efficient pimp, your cut is HALF of what the hired help bring in! And that's being a generous, er, "manager."
And the service sells itself - it has for thousands of years. No crazy sales and marketing budgets required.
