As long as he indicates that it's anecdotal (as he did throughout the piece) I don't see an issue with sharing it with the world. It's not like he's selling himself as a car buying consultant; he's just sharing the fruits of his private labors with anyone who it may help. He's a Harvard MBA grad; I'm sure he's proud of his skills. I can see that fostering the desire to make a dedicated website. But then, I tend to see the best in people before considering the worst (which is probably why I'm not a businessman at heart).