It's all taste of the person like anywhere else, some providers I've seen are the expected IOP you get with a session, sometimes bad sessions, but then others girls have asked me what I'm doing later or staying out to wave me goodbye out in public (lol) or asking if I'm married lol.
The positive reinforcement is appreciated even the paid IOP but the ones that show actual interest definitely is even better.
And yes it doesn't hurt to be polite, a few providers I've gotten along with really well even while not seeing each other are keeping up, and a rare few have done huge discounts for me or even more.
All in all consider myself pretty lucky, have had irl civvie relationships as well, and really any positive relationship wherever it comes from has its value and should be appreciated, so always good to be kind to anyone wherever you meet them.