Thinking about it, I should let someone barter me down like that. Like you say, he could also be expecting sex for the money as well.
Unfortunately, as the others have said too, some guys just get *really* excited about bargaining down an escort; I would guess it is about both dominance (woman withholds sex unless she gets paid ?x, man feels angry that she would dare not give him what he demands so man manipulates and bullies in order to gain the upper hand) and about not wanting to be "a client". So if he gets a massive discount, he gets to kid himself that you've given him that discount because he's super-special and super-sexy and you just want to bone him for free because you can't resist. Plus, he'll likely be very aroused at the idea that he's made you do something you wouldn't otherwise have done. He'll feel special and powerful. He'll probably get off more on the pushing of your boundaries than on any sort of normal sexual interaction, so any booking will start of badly and go rapidly even further downhill.
This type of client is literally the
worst kind of person to be on a booking with. That's why we all avoid bargain-hunters as much as possible! I find that they do at least reveal their natures right at the start (because they generally struggle to treat women with respect and therefore see no point beating about the bush when it comes to making their silly demands) so they are easily avoided as long as you delete+block as soon as you see an attempt at getting a discount.
You will never lose out or miss out on anything except an extended nightmare as these guys often have weak grips on reality and no qualms about bullying, harassing or stalking women. Meet a bargain-hunter once and it's often MONTHS (and a trip to the station to report him to the police!) before you can be rid of him; they get so excited by the process of manipulating women that when they have even a small success, they get very, very keen.
Anyway. All this is coming from someone who happily *offers* slightly reduced rates to clients who book in advance (following my preferred procedures in a respectful manner) or who like to spend a lot of time with me. So I'm not at all anti-discount (when done in a way that suits
you and earns you more money in the long run) or against showing a great client how much you value him in whatever way you see fit. But a guy who approaches me out of the blue making idiotic rude demands? He'll just have to go and figure out how to suck his own willy, cos I won't be going near it with the proverbial.