The casino I worked at used some formula to generate the number of 'points' you would earn towards free stuff based partially on the risk of the game that you were playing. They used the ~1-2% number for blackjack (or whatever the low number of when you play what blackjack players call 'the perfect game') rather than a larger number that might be closer to the 'average' skill of players.

This signaled to me that the casinos -- or at least the one I worked at -- in general treat the overall risk of blackjack as the low risk that skilled (non-counting) players can achieve, regardless of the number of people that might come in and ignore the simple, effective strategies to the game. Personally I think that the casinos would rather reduce the risk to themselves from skilled players as well as card counters and just remove all the blackjack tables, sending all those inexperienced gamblers onto games like roulette where they might lose a larger portion of the money they brought with them.