Good question. If the counter were tipping then the dealer has the choice of not telling and getting more tips or tattling to get on the good side of casino management. I think it in large part comes down to the attitude of the dealer, whether he is rooting for the player or the casino. Dealers who are loyal to their employer first will probably tell, and tipping may not help. Dealers share tips so the dealer you give your tip to may only get 1% of it. Tipping cynical dealers who resent tip sharing won’t buy you much cover. In my opinion dealers loyal to the casino are more likely to be women than men and Asians over any other race. One of my blackjack books goes into this in more detail but I can’t remember which one. The decision to tip is hotly debated in the counting community and many counters follow the Stanford Wong philosophy of only tipping if the cover it buys you is more than in value than the tip itself. This may explain the joke that the difference between a counter and a canoe is that a canoe sometimes tips. Other counters tip anyway whether they think it buys them cover or not because they believe in tipping.