Maybe you should remember about your losses when you hit and get a big win. But more than that, some gamblers belief that you have more patients to loss your money than to get it back just to get a title of a big winner.
If we have a copy or save our tickets since from the very beginning, it probably we lose a lot more than what we possibly win. That is why it is better to forget the past and never think that we could recover all the losses we have before cause it looks impossible and knowing the fact that our chances in winning are too thin.
However, we've been not tired and patiently waiting for our luck and in one day we might hit the prize. This is what it means in gambling, keep trying and losing as well.