- There is a state sanctioned minimum payout rate. This differs by state, but its between 80-90%. This means that on average you lose 80-90% of the $$$ you put in.
- Slot machines cannot use conditional probability, in other words spins are independent. This means that the machine has no "memory" each spin is like rolling a dice. You dont have higher chance of payout just because you didnt won anything during the last hour.
I've worked for a big slots company and we analyzed our customers a LOT. The big players (AKA whales) who drop thousands per month are not bored rich people in 99% of the cases, they are average people like you and me with a bad gambling addiction. And the state or the casino companies are doing nothing to help these people (why would casino companies care? This is where they are most of their revenue from). This is totally different from other fields - imagine if cigarettes would be advertised as something that makes you healthy and the state would be OK with it.