The way I always saw it is they are just like us: They rate and remember. If they're any good, I'm sure they keep their own dossiers on us. I know for a fact more than a few follow what we say in this forum and others. As in any other business, repeat business is key. So, if we are deemed a "good" customer or one that makes their job easier or more pleasant, they'll remember and make it a point of encouraging repeat business. The opposite is true: If you are a "bad" customer (B.O., rude, disrespectful, too aggressive, no show/bolter) that too will be remembered the next time you book, especially if the provider is in high demand.