This whole thread is horse shit.
If a lady wants to offer a special...
If a lady wants to lower her prices...
If a lady wants to raise her prices...
If a lady wants to give it away for free...
It's her time, her body, and she can damn well do what she pleases. (I can't imagine seeing the number of fat, old, smelly, arrogant, abusive, pushy SOB's that show up at many of our lovely ladies doors! No amount of money would be enough in my book!)
That being said, I see nothing wrong with a gent politely inquiring if there are any current "special" donations, or asking about a donation rate that's not published. (e.g. a 45 minute rate, versus a published 30 or 60 minute rate.)
Interesting semantics though...when you're buying a house, or soliciting a contract it's "negotiating."
One thing I'll guarantee...any smart consumer in real life is remiss for not negotiating. (For example, who ever says, "Oh sure, I'll pay full sticker price for that new car.") I'll bet" The Donald" didn't get where he is today without honing the fine art of negotiation.