I believe the point is that wedding photography is really hard work compared to taking casual photos (or a more part time photo-journalist style).

It sounds like the author already has a career doing something else, so perhaps even at $3k a pop, weddings are too much work to be very enjoyable. I've also shot a friend's wedding (partially as a favor, partially just to see what it was like) and I can safely say I don't ever want to give up software development for wedding photography.