It depends on the customer.

If they look rich, then you charge them per minute, if not, then per 5 minutes. If you do that, then you makeit last as long as possible and with exorbitant fees.

Either that, or charge per... yeah, that's just wrong.

Why do you get me into these situations?! If I was a Puerto Rican I'd be able to walk the streets safe in the knowledge that I wouldn't be asked such difficult questions, but noooo.

Back to the topic at hand - yes, it does pay well, sometimes. You've just got to advertise in the right places.