My 2 cents:
All jobs have good days and bad days. Money is an evil we all are forced to live with. Few people do a job they actually enjoy, but needing money makes us spend our limited time & energy & sanity to get it. Tough to do that consistently for any kind of work, let alone for sex work. SW's are doing something that's very intimate, so the more they feel forced, the more it will take a toll on their mental health, and eventually break their spirit with self-loathing and bitterness.
Sure, I would not want to get ghosted or given the run around, but if a lady I want to meet is feeling sick or just too bummed to work that day, I understand it. Even with the most fleeting & anonymous sort of encounters, I'd rather hear she's not available, than find out she's making herself available when she really shouldn't be. If they quit doing SW entirely, because it takes too much of a toll on them, I understand that too. No matter how much I might miss my favourite ladies when they are gone, I definitely do not want to contribute to some sort of breakdown if they force themselves to continue work that they have come to hate.