Nobody bats 1000. To extend the metaphor, a baseball player is considered highly successful if he can hit one out of three pitches.

People tend to emphasize their successes. Not only does it naturally fit our desire to inflate our ego but confidence is often considered important to attracting others to ventures.

This skewed emphasis is especially prominent online. See http://healthland.time.com/2013/01/24/why-facebook-makes-you...