Quick show of hands of players with really cool Rare or Unique Weapons and Gear gathering dust in your inventory. ::Waits for it:: I thought so.
Since it costs such a ludicrous sum to upgrade higher-grade weapons, I think most of us keep these things around for sentimental reasons, but never plan to use these things again.
How much trouble would it be to include a display case or something for things like this? Just a notion. Cheers,