Yes, you can play online slots for real money at licensed casinos in states with legal online casino gambling. These sites offer a wide range of options where players can bet and win real money. These winnings can then be withdrawn from the casino through various banking methods.

Most sessions on slot machines will result in losing money, and there's nothing you can do to chance that. Sometimes you'll win at slots, and even win big. Enjoy those times when they come. But never bet money you can't afford to lose, and be sure you're playing games that fit your bankroll.

Thus the strategy is an instantiation of the St. Petersburg paradox. Since a gambler will almost surely eventually flip heads, the martingale betting strategy is certain to make money for the gambler provided they have infinite wealth and there is no limit on money earned in a single bet.

While this strategy can lead to short-term gains, it is inherently risky and does not guarantee long-term success. Many casinos and gambling experts caution against using the Martingale system, as it can lead to significant financial losses if a losing streak occurs.