Alcohol can forget everything including that he won't think he has spent a lot of money even though he only remembers that it was just a little and gambling under the influence of alcohol then it will have a bad effect because he is half-conscious.
Alcohol can make us Blackout meaning we can forget or may not know everything we do that very moment.
But he realized that even though he lost $3M and it is true that in gambling winning or losing will still happen so it must be realized for all gamblers.
or maybe because that amount is a little to nothing for him , this is why he just react like that.
Although he lost by not experiencing any major depression it should not be imitated maybe he has more money reserves than us, never imitate the gambling style of a pope they are still immune to money even though they lose a lot while if we lose it will be severe depression.
it is not maybe , Dana really have a tons of money in his pocket , and into his accounts .