Very unfortunate that gamblers don't see the negative impact of their gambling addiction. These gamblers don't wonder why some of their relatives hate them and have no close friends anymore because of their changing behavior.
It's because they are focus on what they're doing and not giving attention to those people around. In this state, the gambler is already addicted or bound to be one. That's why it's really crucial to gamble in moderation and don't let gambling affect you negatively to the point you don't care anymore to what's going on outside gambling. Though it's not right, many gamblers are still becoming addicted despite the reminders since they're motivated to gain huge.
Greed is like an inbuilt feature in our mind, and it doesn't affect a gambler ones, it start gradually and if it occupies the mind of a gambler the gamble ends up becoming addicted. Greed starts true emotions, if you lose you think about your lose and it also makes you chase after your losses. There might be an amount of money a gambler will lose and he will not stop thinking of it.
Yes, everyone has greed in them and in fact the question of whether someone will apply greed in their gambling involvement or not depends on their perspective on gambling, if for example from the start they see gambling as a place to earn money, then it is clear when they succeed in winning at one of the sessions they do then they will most likely apply greed to pursue greater results.
And also yes, the impact of greed will be able to trigger significant emotions and regret, because of course the goal of greed is to get something greater, meaning there is hope behind it and when that hope is not realized then it is clear that emotion and resentment are things that they will definitely feel it, and yes, this greed can also trigger actions to chase losses. Therefore, this is why mistakes are always prohibited actions in gambling because they can lead someone to a worse impact on their financial situation as well as their mental and psychological situation.