I don't know what it is about collecting stuff. I've been guilty of it several times in my life.
For example, I love monster trucks. Monster Jam partners with Hot Wheels and makes 1:64 scale replicas of the trucks. I always thought these were really stupid and never understood why people on Facebook have collections into the hundreds.
Anyway, every March is the World Finals in Las Vegas. This year will be my fourth year going.
My favorite driver, Jim Kohler has his Avenger truck;
Every year for Vegas, he does a one off body for the event.
So I decided, as a souvenir, to pick up the limited runs of my favorite truck at every World Finals I've attended. This resulted in me having 3 1:64 scale monster trucks in my cubicle at work. For reasons I can't explain, I now have 30 monster trucks in my cubicle, and the only reason I stopped buying them is because I ran out of room.