That's exactly it. And that's how the sp's reasons & motivations play a huge part.(Which is why some, like SNL, can honestly say they enjoy their time fully, because they aren't in an mp doing the same thing 3-4+ times a day, they don't over do it. )
If you see numerous clients a day to make as much cash as you can, and to keep up with an expensive habit/lifestyle (clothes, travel, drugs, whatever..) - I'm sure you'll feel very differently about it than an sp who sees it as a great way to have more freedom with her life and chooses to work when she wants to. Yes, the monetary rewards are a reason for enjoying this work, no one is denying it.
HOWEVER Not all of us are interested in making as much money as we can, some of us see it as a great and FUN way to make good money without having to spend 60hrs/wk slaving away doing something we don't enjoy! Just like for any other work, faking something you hate doing ultimately does not make you feel great about yourself, no matter how much money or shoes you have. (I know, because I've done it... and it had nothing to do with escorting or sex.
I wonder who ends up feeling more disgusting or disgusted with themselves down the road...? Those who enjoyed it.... or those who didn't?