You are coming up with the assumption that the gamblers must gamble with the mentality of "winning more money or at least losing less money". I've always thought that this is a wrong mentality. Gambling is supposed to be fun, not a chore(assuming that you know when to stop and don't get addicted). To me, the mentality of gambling in order to win some money will always lead to addiction.
I wouldn't play boring games like BlackJack or Crabs only because they offer lower house edge and I have a higher chance to win money.
Just play more interesting games(even when they have higher house edge) and know when to stop.
At the end of the day, the casinos make most of their money from the gambling addicts. This is the ugly truth.