Patterns of percentage paid out are great if they work . all i ever hear about any more on any of these new classes of slot machines are "its all random' no pattern to be followed ...im not convinced . i have found some patterns . for instance while playing on multi dom units ( a good example of this would be the Buffalo series of games ) it seems to pay more often on upper level bets or as i like to think of it as bets not as likely to be made by a player as compared to low end bets that are Highly likely to be made by a player . now that could relate to set percentage payout perimeters i dont know & its not all way consistent i will say that.