The soap fee in limbus doesn't count because you get enough coins to turn a profit from it unless your coin prices on whatever server you're in are complete shit.
The cost of food,nin tools you would be using on something else anyway, easily craftable meds, and stuff you can get from a hi pot tank drop during assault are the only expenses in limbus. All of those expenses are paltry vs the cost of either a. leveling leathercraft to 100 in order to make a +1 dusk or b. paying the giant fee most crafters will charge you for when they eventually do HQ.
ALSO. you're obsessing over semantics. just drop it ok? not everyone on the planet has access to dusk +1
XI Wiki

