Dead right, smiths.
I saw a WG about 7 years ago and, after we'd finished, I gave her a good tip because she'd given me a good service. When she thanked me for the size of my tip
, I said that I thought her fee was on the low side and I'd given her the tip to bring what I'd paid her up to what I'd have expected to pay for the service she'd given me.
I noticed that, within a week, she'd increased her fee to a bit more than the total that I'd paid her.
And that, within about 6 weeks, she'd reduced that new fee to the amount that I'd given her. Market forces, I guess!