You are right.
I know when hosts are on the way out the door, they make sure they take a client list with them. It's almost an unwritten rule, for when they wind up at a different property if they don't perform they won't be there long either, The best way for them to do it is to try to take their best players with them.

From what I heard, they either don't trade info or as someone once told me it was either illegal or against their policy.
At the same time, I have had hosts tell me "I checked you out" so what they say and what they do are two different things.

If you walk in the door and present yourself in a decent manner, most places are still willing to give you a shot maybe even two but if you don't tow the line, don't expect to go back on a freebie the third time