what advert did you post ?
I tend to post something along the lines of:
A LITTLE BIT OF YOUR TIME
I am a xx year old gentleman, looking to spend a little bit of time with a lady xx years old or over, to fulfill my needs, for which I am willing to reward.
Within ten minutes of posting, all the spam replies come in. It's not normally until a day or two before serious enquirers appear. I am always polite and to the point with my requirements, and ALWAYS insist on a phone call before travelling.
In the last two months, I have had four meetings, covering three girls, with another meet lined up. I'm nothing special, just a fat old git, but I am always polite and understanding.
if the girl changes her requirements, that raises a flag for me and I politely end contact. Although I did give in to an air hostess who tried it on, and it was brilliant! I don't haggle, if she wants more than I am giving, she won't be happy doing it for the lower price, so it doesn't happen.
I recently suggested that someone wrote a bit like a spambot, she retaliated, getting angry, but I stayed polite and broke off contact. Then my adverts got reported and deleted, so I reworded them, they got reported, so I waited a couple of weeks, then reposted.
Be polite, respectful, never get drawn into an argument, don't negotiate, just politely decline.