study published in Personality and Social Psychology Bulletin found that people with narcissistic personalities were 50% more successful at pitching movies than people without. On paper, the pitches weren’t any better. The theory is that people who’ve convinced themselves they’re creative and their ideas are great end up being the best at convincing others of the same. "Self-promotion is a valuable skill, but it benefits everyone to realize how much it can distort perceptions of quality."
In no way does this explain why my standard pitch closer, "please, please, oh Jesus please, I’m drowning in failure," has met with so much success.