They do… for market research, fun, or both. Now with Grindr and a likely hookup at the tip of their fingers they don't do it as often but I'm sure it happens.
Some escorts may not do it just out of discretion.
I have escorts who are my friends and my posts on this area are hearsay but my friends are honest people who tell it like it is. If they had a good week they tell me so and if they didn't they share that with me too.