Kashe, Incarnate of Commerce
Omnipresent shopkeeper that, being a physical manifestation of Trade, is a wealthy businessperson that provides special items and deals for high and dangerous prices...

Stealing wouldn't be wise, as trade must commence, consciously or not, and attempting to take from them will always initiate a trade. Whether Kashe takes money, items of your own, or the mind... memories... the very soul of the attempted thief, all depends on the price.
...They do prefer to take money though, but at times there's no option but to end up driving mortals insane for the price of their merchandise.