We all know that nothing good can ever come from greed, and similarly, when we expect an unrealistic amount while gambling, we are more likely to lose, because very few people win an unrealistic amount by gambling.
Yep. If we do it with unrealistic amount, we must expect more for the wins. This is very untrue because this only leads to the severe losses. That's why a gambler needs to understand well the nature of gambling and he/she must have good mentality before starting to play gambling games. If we do this, we won't gamble excessively and won't dream to win unrealistic amount of money.
I think that many people have recently heard about James Wynn and how he first boosted his deposit from $3-4mln to $100mln with the help of x40 leveraged futures, then squandered all the unrealized profit and even went into a minus. In fact, futures with such leverage are the same as gambling. In my opinion, his case is a clear example that greed, haste, and unrealistic goals don't lead to anything good.