I seriously doubt dealers would count. They have plenty of duties involved with dealing, keeping track of players/dealer totals, paying out, keeping track of player buy ins, talking with player etc., I seriously doubt many would be able to keep a count while doing this.
If they do exist, I imagine them to be in some sawdust sweaty casino in Vegas. Have never even remotely encountered a dealer who I suspected of doing this. Maybe the quiet ones who don't advise the players on the hands might, but from the advice they give out, the vast majority of dealers don't even know perfect BS.
