Because not only do we post neatly, we take time to organize the boards so that even those people who don't post neatly end up having neatly posted posters. We have a very strange obsession with things looking orderly.
Turning a first time customer into a regular customer. I also love posting. I have two guys I work with, one who has been with me for 20 years and one for 15 years and they both take great pride in their work.