The first mistake is that after winning in gambling, the gamblers become greedy and think they can win every game. They take more risks and then lose everything.
The second mistake is that after losing in gambling, they want to play more in order to cover the loss. When you play for covering your loses, you will most probably lose more.
This is actually funny but that's just the truth, gamblers keep loosing all in a bid to make a winning attempt that could bring luck, sometimes quiting for the day isn't the acceptance of defeat, but it makes you go home to rethink and reposition yourself on a good more advance strategies to play for the next day, some may even stop and cut the loss for the day instead of several failed attempts, a gambler should be very sensitive in knowing the right time to stop or continue on gambling if winning or loosing, some gamblers win at a time and leave the place for another day, everything requires wisdom.