What sucks about this game (roulette), your numbers will either hit on that visit *OR* they won't.....then go home. What an unreliable way to earn money (lol). That 11, 7, 20, 32 you need to hit, well, it may not.
Regardless if you are playing dollars or black chips, makes little difference. You either profit for the day or not. Tough to pin your "knowledge" of the game on....your number(s) might hit (lol).