Ultimately, I can't how you can knock a grown ass man for paying for something HE can't get for free, just because another dude can.
He may not have the looks/personality/swag/etc. to get the chick he wants and doesn't want the chicks he can get.
Some men may be perfectly happy with the joints they can pull without tricking, others may indulge in some pay for play. A lot of guys do both. Smash the 5's for free and pay for the dimes. Considering that most men can't pull dimes for free (statistically impossible), then if they want to have that experience, paying may be the only way to accomplish it.
I realize for some guys, the main draw for sex is the desire coming from the woman to copulate and the enjoyment she gets from it. For me and some others, that's fine but wouldn't be a necessary element, if she's physically ideal. The visual and physical stimulation (which they are paid to be "good" at), provides enough enjoyment to justify the experience.
I don't expect to convince a non-John to become a John, but to provide viewpoint of the rationale behind the lifestyle, and try to move beyond the name calling and shaming.