Somebody hit the nail on the head - it's show and tell. How many posts have you seen where somebody will post a picture of a gun they just bought and 15 people will post pictures of guns they own.
Actually, I was wondering just the other day why somebody would post 6 or 8 guns they own in their signature. Uh, Winchester 94, Remington 1100, Ruger MKll..........etc.
To each his own I guess but honestly , most of the ones I've seen wouldn't win any gun collection of the month contests.