Well James1549, after looking at your links I'm going to guess that you collect shelving.

Kidding aside, that is an impressive collection. In your second link the cat looks like he is just yearning to get at the cars and bat them about. Your benchmarking past time is one of the most offbeat ones I've ever heard of but sure sounds like fun. Do you do that by yourself or do you go out with a group?

I don't collect anything but house dust and unintentionally old computer parts as I keep replacing failed components with new ones and not throwing the old stuff out.

To get back on topic, I don't collect golf *****. However, there is a mini course next to where I work and which my manager drives past constantly. He is always stopping to pick up errant golf *****. He figures he'll take up golfing when he retires.