Well, I rarely make big wins, most of the time I either loose a bit or win a bit. However there was once a game here in the forum about guessing the value of bitcoin at a certain date. Some legendary member offered something around 2000 (at that time) and I happened to be the one guessing (and it was difficult believe me, there were lots of people). So I guess that was my "big" win.
Well that was normal. Even me and many others here does rarely win too not just big win because that was what gambling is designed for, for the people to lose money but many will not care much because on top of it is that they still have a thrilling and fun experience. Congrats by the way for that awesome win you got last time but im not sure if we can consider that as a gambling because you are not ask to pay for a fee to be able to participate right? But if that amount was your last big win then maybe the op can consider it. If that happened to me, I will also make the same expression because it's not a joke to accurately predict the price of bitcoin.