There are many people who will find it difficult to do this, because they are already aiming to make a lot of profit from gambling.
But when they start playing, they keep losing their money until they become too addicted.
-cut-
Contrary to common belief, people don't get addicted because they lose lot of money. Losing too much money is just one symptom of either being already addicted, or losing control (which can be a symptom of a starting addiction as well).
It's the winnings that make people addicted enough to convince themselves that they can rise from the bottom by gambling more. Reason we don't notice the addiction on winners, because they don't have financial problems yet.
The hope of getting the jackpot winnings the next bet is indeed one of the reasons why many are still in gambling. To chase the losses definitely is one of the factors that they are after as well. Gamblers will always find a way how to keep his games. Up until he got to the point that he is already too deep in this activity.