I don't think "breaking the code" is what drives them to play slots.

It's the constant belief that one day, they will be able to get the 777 jackpot on those slots. There's no sure way to win these jackpots on these machines, and no algorithm whatsoever has been found to match what these machines are based on.

If I would guess, people are just "addicted" to the thought of winning the jackpot, and that's it.