The dealers that take their time dealing, attract players, and frequently stop the action to joke with the players get stiffed by me (no, you don't need to high five every player that gets a blackjack). Ironically, the dealers that deal fast, don't talk, and who seem to repel players get the best tips from me. And I tip less if there's another big tipper at the table.
That's like another tax! I tip less in losing sessions, don't tip at all if I don't like the dealer's mannerisms. How much do you think is a good tipping rate for a red/green chip player? I try to tip $2 an hour on average, which is 5-10% of my EV.