Can casinos protect themselves against card counters by limiting bet variations in blackjack?
The answer to this is most likely no since a casino wants players to maximize their bets and placing any kind of limit that would keep a player betting lower would not be in their best interests. Minimum and Maximum bets at a table are established to maximize the amount that a casino can win while limiting a player to take advantage of long term odds to win by placing small and large bets over time. The short of it is a casino wants players to make larger bets when they are feeling lucky but they also know that a lot of players are not going to want to place large bets all of the time so they need to allow them to place both small and large bets depending on how they feeling their luck is running.