It's simple; the higher the dependency on luck, the more foolish the gambler is, and the lower the chance of winning, the less attractive the bet should be, and vice versa.
I totally disagree with your point. A gambler that depends on luck is not a foolish gambler rather he's someone I'll actually classify as a realistic gambler. There is virtually no gambling activity that doesn't involve luck because if it never involved luck it won't be regarded as gambling in the first place.
Getting accustomed with betting tactics doesn't necessarily mean you have a strategy that's guaranteeing your win it only makes you turn the odd for yourself as much as you can which in the end still could go sideways if you run out of luck.
Perhaps you got me wrong there. For clarity, a gambler faced with a single game that is 100% luck-based has no choice, and such is not foolish gambling because he just wants to gamble, which is a different case. But foolishness comes in play if there are options where you need to choose between the game that is 100% luck-based and the one where your skills can still reduce the dependence on luck (no matter how little). Everyone knows that luck is always present in gambling, but the dependence on it varies in games.