It probably more appropriate to call slot machines entertainment than gambling, as house always - and we mean always - has an edge with slot machines.
The average slot machine payout ranges from an average of 85% to 99% of all coins bet. The lower denomination of machine, lower payout. This is because casino wants to make a certain amount per hour with its slots. With a one dollar slot machine, casino can payback perhaps 98% and make it's hourly goal. With a lower denomination machine, such as quarters or nickels, payout must be much lower to achieve same hourly pay for casino
There are two types of slot machine payouts: flat rate and progressives. A flat rate machine pays same percentage based on only that machine's results. With progressive machines, many machines are linked together electronically and jackpot gets progressively larger more players that play and greater time in between winning jackpots.
Our advice is to play flat rate machines and avoid progressives. The odds against winning jackpot are much higher on progressives. In many cases, your odds of winning state lottery are better! Play non-progressive machines where you at least have a chance at jackpot.
SHOULD YOU PLAY MAXIMUM COINS ARE NOT?
The answer to this question depends on one thing: is jackpot bigger proportionally for maximum coins bet? If it is, play maximum coins. If it isn't, then simply play minimum and your money will last longer.