It's difficult to get your head around the whole psychology of being a WG, so many say they do it because they enjoy the sex, I like a fillet steak but I couldn't eat 5 a week never mind 5 a day, is it an aspirational job, do they have daddy issues, are they punishing themselves, is it the money? Perhaps some, none or all of those depending on the girl.
But then we're all like that, I couldn't be stuck in an office all day, I couldn't be on the motorway all day, I couldn't be in a factory, building site, stuck at home, we just have different boundaries, we all need to separate work from life and I'm sure sex work is much the same, as punters we manage to climb out of the bed with an SP and into the bed with the OH, some may have to use mental devices to separate the two, perhaps some punters don't kiss SPs, there was a Robert De Niro line from a film when asked about seeing prostitutes he says something like, "I couldn't do that with my wife, she kisses our children with that mouth" I honesty think that the difference between a punter and service provider is that sex is a very important part of a a punter's life, so much so that he's prepared to pay quite a lot of money to get what he wants, and a for an SP sex is such an every day, wholly un-special part of their lives that they're prepared to give it up to anybody that knocks on the door, that's why we struggle to understand their mental reasoning. Similarly with the husband or partner of a WG.
At the end of the day they're selling a service, if it's not the service you want there are plenty more to choose from.