Entrepreneurs need to be made of a different metal from the rest of the world. You have to have the courage of your convictions; you need to be irrationally optimistic; you need to be resilient; you need to be willing to accept the fact that most people will not understand what you're trying to do; and you need to willing to take risks, because you have a bee in your bonnet, which you want to pursue more than anything else in the world. 

This is what makes entrepreneurs so special, and because she needs to ignore what the rest of the world thinks, her ego can be her strong suit. He has belief in himself, and is confident that he can succeed, which is why he doesn't get fazed , no matter how many rejections he has to listen to. He keeps on going, because he's sure that he's headed in the right direction. Yes, it's possible that he may still fail in spite of all his best efforts, but at least he will have peace of mind knowing that he did his best, and was true to himself because he followed his own path. 

Unfortunately, for some entrepreneurs , their ego becomes their weakest link in the chain. They feel that they have all the answers and don't need to listen to anyone else. If anyone disagrees with them, they believe it just means that the other person is too short-sighted to understand the big picture. They will refuse to engage with people who have the temerity to criticize them or to disagree with them.

This can become a sticky issue, which can lead to their downfall. While their ego can be your friend, entrepreneurs also need to remember that their ego can be their worst enemy as well. 

Yes, I'm sure lots of entrepreneurs will have less than flattering things to say about the investor's ego as well.