Machines which have symbols which double all pays and also substitute for all other symbols are the most liberal reel slots you can find. They are better than any of the other machines, because these other kinds are infrequent payers, and although the jackpots may be terrific, your investment and play time relative to win expectancy is better on the "double-up" machines, overall, for the short-term slice of your action while playing.
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Casinos know that many more people will play the $5 slots than $100 slots, and more still will play $1 slots, so they make these paybacks better. Even at only a 2 percent house edge, the casinos still make millions of dollars in profit because of the volume of players playing these machines. But this is also good for you, because you can get a better-paying machine for your gaming investment.
Never play any slot machine without the maximum-coin bet. If you do, you are giving the casino more profits even if you win, because you are not forcing them to pay you the full amount of your win by not playing the maximum coins. Don't listen to anyone who says differently, because such proponents don't know a hog from a horse's rear end.
All modern slot machines are controlled by a computer, which has what is commonly referred to as the RNG, a program which controls the randomness of the combinations. All slots are controlled by changing the payoff programs to whatever the casino wants it to be, usually by means of changing the game's programming chip (which has to be done in accordance with gaming regulations and must be reported and supervised and verified, so no "cheating" is possible).