To make buying/selling this item easier and to use less space in your bank.
Notes:
If you try alch the set it says: "It's not a good idea to do that to an item set!" To get the armour inside, right click the G.E. clerk and press Sets, then right click and press Exchange to get your armour.
This armour set can also be exchanged for the pieces by using it on most banks, bankers, and bank chests.