Some of the most determined slots players track such details by reading a monthly magazine, “Strictly Slots,” that touts its “tips and strategies” for slot devotees. But it represents a monthly shift of about $2.25 million from casino revenues into player winnings, based on Plainridge’s current revenue levels. Plainridge increased its payout percentage by almost 1.5 points, which seems like a minor adjustment. In the short period since it opened, Plainridge Park Casino, the first casino in Massachusetts, has raised its payout percentage by an even greater amount, from 90.07 points in July to 91.43 points in October, according to data published by the state Gaming Commission on its website.Įven small changes in payout percentages can have an enormous effect on a casino’s bottom line because of the very large amounts of money typically bet at slot machines. 31, the highest in almost 20 years at Twin River in Rhode Island, it was 91.87, the highest in 11 years and at Mohegan Sun, it was 91.79, the highest since 2010, according to the data. At Foxwoods Resort Casino in Connecticut, the average payout percentage was 91.98 for the period between July 1 and Oct.