Houston furniture magnate Jim "Mattress Mack" McIngvale made history Saturday night with the largest legal sports betting payout in history $75 million thanks to the Houston Astros' triumph in the World Series.
A good medium is 3% per play. For example, if you're starting with a bankroll of $100, you should risk $3 on every bet. If you're starting with $1000, you should risk $30 on every bet. Your unit size would be $3 or $30, respectively.