Yes. Basically, look at their rate for a regular visit, from there you can extrapolate how much they earn in a day. Then multiply it 2-3x. That is how much they will charge.
Its clearly not worth it.
If you want a regular date, then ask a civilian girl out. If you are lucky or skillful enough then the girl will have sex with you for free. If you don't score after your date then you can pay for a mm to release your pent-up desire.