> Roulette, no way to gain an advantage over the house regardless of what strategy you use.

These days that’s probably true but it has been done: https://www.roulettestar.com/people/joseph-jagger/

He was a smart man:

> After the second day, Jagger kept a clear head and decided that enough was enough, and left Monte Carlo to head home to Yorkshire with his winnings.

> When he got home, he retired from the Mill and invested some of his winnings into property.