If you dont have discipline then most likely you will fail.
Discipline has no link to gambling.
you don't gamble with discipline. That would mean you intend to have a strategy and to win.
You can't have a strategy. it's useless.
I think it has, it is more like discipline not to be addicted to gambling, if you have discipline or self control then you will not lose huge money such as 10 BTC. But I guess 10 BTC loss is too much, it only means that the gambler dont have both discipline when to quit or not and dont have the right strategy.