That's a great story. I hope the mechanic that helped you does well in his new business start. I don't know why there aren't any more Craigslist mechanics out there with the amount of knowledgable people in this forum.
There was one guy in my city that had advertised his bike mechanic services on Craigslist that I used once. He charged me half of what I would've been charged at the bike shop. In fact, he had itemized all his repair services at half of what the big bike shop in the city had their published service price list set at. And when I talked to him, he admitted to me that he was making even more as a Craigslist mechanic than he was making when he was a bike mechanic at the bike shop.