Some folks patronize casinos to dabble.
A couple of bucks at a machine, a few bets worth of buy-in at a table, and quit when they lose the money or score a hit. They know the laws of chance are against them, but are hoping to get lucky. Other people are more serious about their action. They not only show up at their favorite joints frequently, but approach the games with big enough bankrolls to weather the normal cold spells and give themselves fair shots at winning sessions. These solid citizens anticipate ups and downs.