The basic strategy is a tool that can be used to significantly reduce the casinos' advantage in Blackjack. Martingale and other strategies of increasing bets do not guarantee you success. In many cases, you will lose your money faster than you would lose it betting the same bet size over and over again.
The only way to make a long term profit in blackjack is to utilize card counting.
When mastering the basic strategy, the house edge in the game is reduced to approximately 0.50%. The profitability of the casino is therefore much lower when compared for example to roulette or slots.
This is the reason why this game was so popular among the so called "bonus hunters". Nowadays, bonus hunting in blackjack is impossible, as casinos have modified the wagering requirements for wagers from blackjack and similar games.
When mastering the basic strategy, the loss can be reduced but not to the point that it becomes profitable for you.
This is the reason why you will often get some basic strategy for blackjack in the form of a small card when entering a casino. Naturally, no casino would do this in order to make the players win, but it is a good marketing trick to attract more players. Even when the basic strategy is used, the mathematical advantage remains on the side of the casino.