I am definitely a hoarder. I keep all sorts of scraps and parts in my shop and rarely sell a vehicle or toy. I don't even know how many motorcycles, dirt bikes, atvs, minibikes etc I have right now... I think I have 4 collector cars, 4 driver cars and oh bunch of other internal combustion powered stuff. My wife hates it. That said, I get great satisfaction when I am building or fixing something and I find just the perfect little do-dad or scrap of material to complete the job out in my shop.

If I had an identical sized second shop, I would likely fill that in short order too with more "treasures". lol
At some point I will have to start thinking about thinning out the shop but at 55 I still find myself somewhat actively playing and working with the stuff (or junk as my wife calls it).