Haven't been there for ages, not sure exactly how it works now.
Even well-known nightclubs would only charged less than $3000 per head, don't think this one would be able to charge higher than that. Except that the place goes by minimum per room, like most private clubs do.
For $5000/Q, she must be out of her mind! Unless she just want to try your willingness to pay, otherwise I don't think she'll get any customer. If you're willing to pay this price, why not go to 俏佳人、富都會 or even those private clubs? $5000/Q should be the price of those part-time photo model (i.e. not famous or no name at all, they're those you'd see on magazines like Milk, Face, etc.)
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