Understand why casinos and racetracks stay in business - the gambler always loses over the long term.

The remark distills a basic principle of probability and the economics of gambling: casinos and racetracks are profitable because their games are structured with a built-in advantage (the “house edge” or takeout). While an individual gambler can win in the short run through variance, repeated play pushes outcomes toward the expected value, which is negative for the player. Vos Savant’s phrasing frames this as a practical lesson—look at who stays solvent to infer where the mathematical advantage lies. The quote also functions as a caution against confusing occasional wins with a sustainable strategy, emphasizing long-term expectation over anecdote.