I think there is an inherent need to aquire hardwired into all of us. Some collect knives, some stamps, some paintings, some coins, etc. Heck, I've got a friend that keeps a running tally of how many women he has been with (a truely mindboggling number). That's a collection that EVERY guy has, and some try to brag about and lord over others. Everyone wants to possess something. If you don't believe me, when was the last time you went to a museum or a zoo (Both are nothing more than large collections), and do you know to the decimal how many men/women you have been with? Why does one person collect stamps and another collect african tribal masks, personal preference.
Now, why does someone collect something that they have no intention of using? For most, collections are an amassing of rarity, and with rarity comes a perceived value. Perhaps a particular production knife is not terribly rare in-and-of itself, but a collection of every model (and model variant) produced by production maker x from its inception until its demise would in fact be rare, and most likely very valuable. So "Boats," you would fire an unused garand even though the value of said rifle would drop. Would you fire a one-of-a-kind engraved and inlaid Colt Peacemaker, knowing that at auction it will bring in excess of $1,000,000 in its current condition? If you were the owner, would you draw a mustache on the Mona Lisa? Or, chisel the anatomy from Michaelangelo's David? Any factor that deteriorates the piece from "mint" condition reduces the value of the item. To a "true" collector, use is tantamount to any of the above.
I wonder, "Boats" is there something that you would collect if you had the means, or perhaps that you do collect because you have the means?
I'm not a psycologist, but I don't play one on TV.