Philip Yancey nails it again!
The problem with most Christian "evangelism" is that it tends to look for people who we think can help us in the mission of the Church. We look for the "qualified" or the "able."
Those aren't the people to whom Jesus reached. He reached those about whom no one would observe, "She/he has so much to offer."
Instead, Jesus offered these outcasts, marginals, and notorious sinners new lives through repentance and belief in Him.
He made of them the only kind of people who ever give God or humanity anything of lasting value: People of humble spirit who know that they're nothing without Christ, but who also know that--in good times and bad, surfeit and surplus, they can do all things through Christ Who strengthens them.