i've never been berated for a low (or no) tip, EVER. Yes, I've had the up-sell in advance and NEVER tip before, and its usually not a problem (i think some girls who try this may have felt burned in the past, but who knows...). there may have been a few times, when a lingering, hovering sensation occurred during the pull the 20s out of wallet for tip moment, but it was never explicitly suggested, and whatever I gave always seemed fine. I've gotten enthusiastic responses from a 20 and find that 40 (my usual tip with repeat ladies) is always appreciated. I would also like to say that for those that got a 20, if i saw them again, i still got the same service. That's just my experience.