It depends on the client and your relationship to them
I think there are a lot (and you KNOW) which they are, who fetish-ise (sorry sp) our lifestyles, they want to hear you are a nymphomaniac and couldn't possibly get enough sex elsewhere and you love it the money isn't even a thing its just a bonus, also a safe answer if you don't know them well
I work in the city and mostly daytimes so I do get a lot of regulars who are both intelligent, know me quite well and level headed about the nature of the relationship, I tell the truth for me which is that like any job there are parts I like and parts I hate, if they genuinely want to know I tell them more, also use a variation of this on some more normal ones I don't know well or at all but limit the 'don't like' sector to the annoying people on the phone and uncertainty of self employment/long hours if touring, OP said sometimes comes over as tired as do I that's one way to do it.
I think some men think we just roll out of bed jn a hotel looking perfect, unpacked, clean and rested and can f### a few hours then be lazy and that's our life.
If I'm in a hell of a mood and it's a first time client I never want to see again bc they're annoying the hell out of me I tell them what the OP said, that any escort who says the money is irrelevant wouldn't be an escort she would just use tinder and pick the men she liked the look of (I REALLY try not to use that one but occasionally you just get a client you want to punch in the face)
But everyone's different in how comfortable you feel reminding a client that they're a client, if you're looking for minimal drama turn around and ask how tired you look now