If you play often over a one year period, then maybe there is an 80% chance that you will have a return of 88-92%, and over a lifetime there might be a 99% chance that you will have a return of 88-92%. And the more you play, the more likely this will happen. Unless you hit Megabucks, you 'will' get a 90% return on your bets over a lifetime. If slot machines in general are set to payback 90% over a year, or over a lifetime, it is also true for the person who plays it (over year or over a lifetime). This is an interesting observation, and it's something that gamblers may not consider. I don't know what the percentage of payout is, but it's set pretty tight.and of course, you know that just because something says it's a 90% payout, doesn't mean YOU will win 90% back.that 90% is over a year's time, or the 'life' of the machine.or some other timetable that no one knows about! The cruiseships don't really have a gaming commission like Nevada does.