I would have to think, though, that it would take a certain type of guy to be married to a provider. One who wouldn't feel jealous about his SO having sex with other guys (which rules out probably 95%+ of all guys), and who's confident about his own sexuality

and prefer to believe that the woman is not attached. I agree with your second point as well.

 
Given the law of physics. There must be some clients out there who like the idea of being "socially superior" to the SW SO

Dead beat blood sucking parasite worse than bed bug.

Exactly. My question is why do women do it

Magnetism?

I guess it all depends on what one wants.

Was factored into the selection process. What the customer deems as an undesirable trait. Could influence if they decide to patronize the lady's services, as who you keep as a SO, is a reflection of who you are.

That does not mean you can't spin a record.

...and like you said, every one has a limit to what they believe to be acceptable behavior.

I think it's on Tralfamadore.  Of course, they also communicate there by farts and tap-dancing.   You could ask Kilgore Trout.  But I'm sure you knew that.

It's definitely not what you "have to pay for".  

Those SO's get the PMS, the depression, the drinking problems, the whiney kids, the sweatpants and no makeup, the screaming at you because her mom is being a bitch and it doesn't matter if it makes sense... They get the stress about past due bills, and if they know, the stress of knowing that their wife or gf doesn't know where her next paycheck is coming from or when.  They get nights alone while she is on the road, or doing an overnight with someone else.

What they don't get is full hair and makeup, sex whenever and however they want, and they sure as heck aren't getting skimpy little outfits and threesomes every night of the week.  Truth be told, the majority of them don't even know, and will never even get to mooch to his hearts content, the way everyone seems to think they do.  

The SO's of escorts are getting the same end of the stick that you are when you're at home. Just like you, they've found a person that they connect with, and all the "deal breakers" are worth it to be with her. Truthfully, you guys are getting what the SO's don't, so why let it bother you?

We don't sit here and think to ourselves "you know, that wife of his just sits on her ass all day doing nothing and all he does is support her!" We know better than that, and so do you.