Oops I did it again.
I looked at the rules, and found some bro-ken.
It takes 500gp to make the Robe of useful Items.
If you hire 40 guys to work on it, they can make it in a day, and the total cost comes up to 600gp
If you do this 10 times your expenses run to 6,000gp.
Assuming average rolls on the properties of the robes you end up with:
20 Daggers
20 Bullseye lanterns
20 Steel Mirrors
20 10ft poles
20 50ft hempen ropes
20 sacks
800 gp
7 Silver coffers (value: 3,500gp)
7 Iron Doors (Value: Freely make doors in 10 vaults)
80 gems (Value: 8,000gp)
7 riding horses with saddlebags (Value 553gp)
36 potions of healing (value 1800gp)
8 portable pits (value: unknown)
7 rowboats (Value: 350gp)
8 spell scrolls of level 1-3 spells (value: 400-4,000gp average 2,800gp)
14 mastiffs (value: 700gp)
6 Instant windows (value: enter another 6 vaults)
4 portable rams (value: 16gp)
10 robes (value: 10gp)
Just the CashMoney treasure options (Gems COffers and Gold) you get 12,300gp out of your initial 6,000gp investment
Then take into account the sheer number of dungeon shortcuts, work animals, adventuring gear, and spell scrolls? then remember it is all really light until pulled off the robe.
Hello near infinite wealth.
EDIT: FOrgot the potions