The power of one is magnificent.

1/You need one yes out of all no’s to find the love of your life.
2/You need one friend willing to quit his full-time gig and work with you in the garage to build something big.
3/You need one idea to keep leading your life to eternity.
4/You need one lead investor willing to commit, and the flock of rest will join.
5/You need one customer willing to pay for your broken, semi-working product to kickstart your startup.

We are all scared. We are all simple people. We are risk averse. Anything out of the ordinary means No.