I think ego comes from emotion and emotion can play a huge dangerous role in gambling. It does in most cases. I have lost every bet I have ever made based on my ego.
And even if I won two or one, I can't remember it now.
And I have seen many people who have lost huge amounts of money by betting only because of ego. So I would not recommend anyone to gamble based on ego.  And besides, I always want to suggest everyone that whenever you feel like you are placing a bet for your ego, then you will understand that you have lost control over yourself. And I would say at this time to take a break from gambling as soon as possible for that period.