Playing devil's advocate here :mwah:
What if we turn that discussion around.
Some women may look on the fact that a man is so sexually attracted to her that he's willing to pay hard earned cash to sleep with her as a massive compliment. Others, of course, would be offended. But how many of these "offended" women will quite happily accept, or in many cases expect, a guy they meet at the bar to buy her drinks all night. Now, nobody is saying that entitles the guy to expect anything in return but WHY does the woman feel she's entitled to free drinks all night?
Could it not be said that either consciously or subconsciously (and sorry but I suspect it's the former in the majority of cases) she's using her sexuality to exploit the guy.
Regarding your statement that you're happy to buy a woman drinks all night for the pleasure of her company with no ulterior motive (and please don't take offence here) I have to question whether you'd be so generous if it was a guy you were talking to.
A little story to illustrate my point.
A few years ago I'd arranged to meet my girlfriend at a club. I arrived about half an hour after her. She was chatting, quite innocently with a couple of guys she met there whilst she'd been waiting for me. In that time they'd bought her a couple of drinks. She told me they were nice guys and she didn't think for one minute they were trying to hit on her. It was absolutely no problem for me as I trusted her implicitly but I smiled at her and asked if she thought they would have bought my drinks if it was me they'd met. She smiled back at me and said no she didn't suppose they would have