Playing without paying attention on other details is a suicide and it's similar to giving away your money to the strangers .
They play using their own money because they are also expecting for some return but if they don't like to verify their bets then it's better if they will only use fake money or faucet money to play for fun .
Sometimes, they use fake money or faucet, but at the other time, they will deposit some money, but not to be used to gamble all day long. They can expect to get the win money, but they also need to win the games will need luck. And if the luck comes, no matter if the site is fair or not, you will win that. We can play without thinking about fairness if our reason for playing gambling is not chasing the money.