Well "Gambling " is a term often miss applied to heads up play.
Heads up playing is a contest of skill with luck factors.
Some people don't enjoy playing for money or stakes. Some have religious reasons. I respect that. A close friend that I would spar with after work didn't play for money. One after work visit to the tavern had me hearing a grumble as I passed a couple on the way to the restroom. The guys statement to his girl companion was, "this guy shoots so good but he won't gamble." His tone was derogatory, so on my return I cordially offered the opportunity to "gamble" on the adjacent and open table. Explaining that I like to gamble.

He probably had a Grumble for the companion as they exited the bar. He didn't win a game. A real shame.

He thought he could play.
