Making a living from card counting in Blackjack is theoretically possible, but extremely difficult and risky. It requires a high level of skill, practice, and discipline to track cards and make strategic bets. Even with skill, the edge gained is often small, meaning a large bankroll is needed to handle inevitable losing streaks. Additionally, casinos are well aware of card counting and use various countermeasures to catch and ban counters, making it risky for anyone attempting to earn a living this way. While card counting is legal, casinos can ask players to leave or bar them from playing. Overall, sustaining a career through card counting is challenging and rare due to the constant risks, the need for discretion, and the small edge involved.