If you are going to rely on your personal experience to convince me you can't find a woman who will have sex with, unless you pay, I can rely on my experience for to dispute it.
No, you can't. You said that anyone can get laid. One example is not enough to confirm that, but one example is enough to disprove it.
It just so happens that tomorrow, September 14th marks my 53rd year of sexual activity. I've been active in the "market" (casual and non casual) for a long time.
Well, bully for you! But not all of us are that lucky.
And note that you grew up in a very different time. According to your timeline, you started having sex in 1971. A very different world.
Economic theory defines a market as any system which reduces transaction costs. In other words, something that brings seller and buyer together to exchange a good or service. Sex is a strange market, as both seller and buyer are the service. Weird, huh?
There are also market failures. Like a minority of men (aka "players") being able to bed most of the women in the marketplace because women go for the hottest guys who happily oblige. I know a player like that. He is shuffling a "harem" of 4-5 "girlfriends" at any time, and changes them monthly. Since male:female ratio in the human species is nearly one, that means that 3-4 men are left out of the market at any given time, even if these women jump back into the marketplace right away.
It probably wasn't like that in the 70s, but it is now.