I understand if one is a backup but owning 3 is like... pointless. The signatures on this site are like "iPhone 5 64gb whiteiPhone 4S 64gb BlackiPhone 4 32gb blackiPhone 3GS 8gbiPhone 3g 8gbiPhone 2g 4gbiPad 3 64gbiPad Mini 32gb+celluar
Sometimes people leave their older idevices in their signature to show they have experience of that gadget.
Some people don't need to sell on their idevices so they keep them in the original boxes for prosperity.
What you see as "pointless" another see's as an investment.
"One man's trash is another man's treasure"