I had a niche site like this back in the day, and I also has a merchandise page built on Cafepress. I didn't sell a single shirt, but I had fun by the idea that I might. Cafepress pages take at most 30 minutes to create.
Heh, me too, and some random guy on the other side of the world actually bought a clock with my logo on it. Other than a few mugs for myself that was literally the only sale I ever made. I often ponder what became of that clock.
Did you ever try to track it down? A documentary connecting buyers and sellers of low-quantity sale cafepress items might be lovely.