My biggest win ever was $10k hitting a major jackpot on 1xbit casino. But it has been 3 years already and frankly speaking i busted the rest amount after withdrawing $6k. I was playing a slot game and base bet was $10 each roll. That time my bankroll was around $3k worth.
But i want to tell everybody that it doesn't matter how big you win in gambling, it is important how much cash you managed to withdraw in the end.
Right now i controlled my gambling habit and not playing at that much as before.
And that is the hard part, because once you have tasted that big win, you inch closer and wanted to win higher than the last one. And it might not end good at your end, as you might lose all that $10k and then eventually all your bankroll. Probably my biggest win in a land base casino is around $5k in a night, come back the next day and almost lost everything. Good thing I was able to control myself and go home with still some money left.
For me, I would rather lost everything that bring that feeling of disappointment going home, we just need to be realistic, sometimes we win, sometimes we lose, that's just the life of a gambler and we are stupid if we only accept winnings and not loses. Professional bettors that makes a living in gambling treats it like a business, they have some profit and expenses (loses), what matters is they end up with net profit in the end.