It seems like it would either be very capital intensive, or it's going to need to operate like a bank. Also, folks in these situations tend to be very transient and have fluctuating income. How do you establish an adequate virtual salary when the terms of the person's employment change?
Forget about massage people -- they are a bad example because two or three customers may make for a windfall-like experience. How about a person who works at the Gap or BestBuy? You might get 35 hours one week, 20 the next, then 18 for a month.