I'm not suggesting any actual collusion or conspiracy with the dealer or knowing what specific card is coming next.
The key to card counting is knowing how many big cards are left in the deck (i.e., Aces and 10-value cards) versus little cards. The value of that information increases as more and more cards are dealt. The dealer can thus help the player/counter by placing the divider card deep in the shoe.
By doing that, the dealer may potentially earn a big tip from the player/counter, and the casino would have no way of establishing that the dealer was guilty of any wrongdoing if they even suspected his tacit complicity in the first place.
Oh, I get what you meant now.
Well here's my explanation.
The House rule is 3/4 Deck cut. This Deck cut have to be confirmed by Supervisors, those Jackets you see walking around 2 ~ 4 tables. But as many know the saying "Rules are meant to be broken". It's very possible for Dealer to proceed himself/herself disregarding that confirmation, or for Supervisors to confirm without even looking. Yes, it's possible and have happened to me even. Keke..
The reason for 3/4 deck, is that 39 extra cards can be dealt after the Cutting Card is exposed, if it's in the middle of a game, any lesser than 39 cards can potentially result in a "no game" especially in BJ. This will cause MAJOR problem for table, and the DEALER'S job. For this incidents, the game will be stopped and surveillance will be notified and the whole shoe will be reviewed.
Thus, it's highly unlikely for a Dealer to risk that much for potentially more tips.
But, highly unlikely doesn't mean zero chance. So I get your point.
Once again, I must stress I don't know how card counting works, but even if the Dealer risked it for another 10 cards, Cutting cards at 1/2 deck instead of 3/4. I doubt it will help the Counter much. What's good is 10 cards going do? It's basically maximum 1 game more.
EDIT:
Also I must remind again, I'm not talking out of my Ass. I'm a ex-croupier as mentioned in #49 of this thread. While rules might differ from individual Casino, they are generally similar.