The reason why is that the casino expects to take 2% of every dollar placed on their tables. This may be the case on average, but not for a good player using Basic Strategy in even a 6 deck game! The advantage is about .5% against a 6 deck player, .18% against a 2 deck player, and next to nothing for a 1 deck player. A card counter takes the advantage against these games using larger bets during 10/Ace rich decks and playing their hands differently to suit these conditions, as well as leaving the table when the deck is 10/Ace poor.
Let's look at the comp figures for most Vegas casinos for Blackjack. Take a $25 bettor. The casino expects the player to play about 60 hands per hour. A good Blackjack player wants more hands per hour, but this is what the casino expects, 60 per hour. They expect to take 2% of this money from the player. $25 x 60 x 2% = $30 an hour! Then the casino gives back to the player 40% of this money in comps, a total of $12 an hour.
Play for 4 hours at this level, and you can usually expect the casino to cover your room. At the more expensive places, you will get a player's room rate. If you're going to Vegas to gamble on your counting system, you may as well get something for your efforts. Where else are you going to find GREAT 1 and 2 deck games? Not at home. Play 2 red at 0 and below, a green with a red on top at 1, 2 greens above this or a combo of green and reds from your win piles and you'll be getting taken care of while YOU expect $30 an hour from the casinos while they comp you for your playing.
