So my question is this,as a gambler what mistake have you made when gambling that prevented you from winning big.
Let's discuss.
Greedy is basic human nature, nothing is wrong with that. I ever in the past when didn't take advantage of the opportunity so that make it all gone. what we can be done this is how to manage it. The meaning is, we should not do the same thing again in the future. So when we have the same situation again, we should be as much as possible to control it. I know $1200 is big money, who doesn't want to get big winning, but if the reality is we only can have chance wins of $200, there is no harm if only take that $200 only.

That's a problem for most since not all the time we can control ourselves. There is a time that we are too aggressive and wanted to win more especially when we got the momentum already without thinking that the next bet will be our unlucky bet. That is why I would say that most gamblers usually can never take home big winnings. This is how gambling works, we can win at this time but can't think that we can win all day and this is because luck never stays long for us.
Well, that gamblers can not win all day is an established fact and its not debatable, even in sports betting, no matter how we know our games and have good knowledge of sports, the team, the weather and every other thing that affects the out come of a match, we still fail to make the correct predictions some times, for most bettors, its most of the time, by this, i mean that their lost bets are always greater in number and sum, than their won bets.
So yeah, gambling, though it offers us the opportunity to make money while having fun, its never a consistent way of making a living, though many have made millions of dollars through gambling, but they also spent a lot too, and even after winning such big money, if they don't withdraw from gambling a bit, they will still lose it all back to the casino.