Well for one your assertion that one may ‘treat themselves to a woman.’ That’s really unpleasant - don’t you see that? You don’t treat yourself to a person. The very idea is abhorrent, the phrasing is abhorrent.
It’s irrelevant if an individual prostitute is willing. The whole industry contributes to the idea that woman are something men can just treat themselves to. It feeds trafficking, rape, crime and enslavement. Of women and of children.
Your average City cokehead makes the same argument - bit of fun, work hard play hard, everyone knows what they’re doing - but behind it all is a chain of human misery.
You say sellers are as bad as buyers because they’re out soliciting. For gods sake of course they are - many have pimps to keep happy. The power differential is not with the prostitute.
Men who buy sex have no regard for women. If you’re buying sex you are part of a vast web of misery. The only mental gymnastics here are on the part of the Johns.
Disabled men have no more or less right to sex than any of us (ie none.)