Yup, thinking about that they can easily duplicate their previous wins may keep them playing, in hope that luck wil permits them and will give that chance to recover but most of the time if not in every case or scenario they will just keep adding money and lead them losing their money to the point that they already struggled with their finances. It's a quick way lose it all of you don't know how to control and balance your money.
The downside is that a gambler often isn’t satisfied with small winnings. Even if he starts off winning, it’s never enough for him. He continues to gamble until he loses his initial winnings and ultimately all his capital for the day. I’ve seen this happen with a friend who is this type of gambler.
Therefore, this is why a gambler must know, understand and realize what and how gambling really is, because when you realize a fact that defeat will always be part of the game and also understand that previous wins cannot be used as a guarantee for the next win, then it is unlikely for you to apply greed.
Without realizing things in the early stage you are compromising your finances, as time goes by and you'll keep repeating that same mistakes you'll find yourself empty-handed, most gamblers regrets those failure those wrong decisions that they've made , especially the time that they've got the opportunity to quit while still have decent amount of profits,
though just the same it's greed inside that needed to be well taken care so you'll not going to regret each decision that you made, more on your own limits and Money management.