Wikihack
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If you use an item with limited uses in a shop before paying for it and in the presence of a shopkeeper, you will be charged a usage fee[1]. This includes items with charges, spellbooks and non-permanent light sources.

Messages associated with usage fees[]

  • "This is no free library, cad!" - spellbooks
  • "That will cost you (n) zorkmids (Yendorian Fuel Tax)." - potions of oil
  • "Usage fee, (n) zorkmids."; - anything else

Each of these messages has a one-in-three chance of being prefaced with "Hey!" or "Ahem."

Fees[]

Usages fees are a percentage (rounded down) of the item's normal cost:

Item class Usage Fee Notes
Magic lamp See below See below
Magic marker 50% No matter how many charges are used, or even if the use was successful
Bag of tricks
Horn of plenty
20%
Can of grease
Tinning kit
Expensive camera
10%
All other chargeable tools
Wands
25% Only if the item had any charges
Spellbook 80%
Potion of oil 20%

The usage fee of a magic lamp depends on how it is used:

  • 'a'pplying it will be charged as if it had the price of an oil lamp
  • #rubbing it will, if a djinni is released, have a usage fee of 133%

Strategy[]

In general, it is preferable to buy the item first (credit_cloning), or even buy&use&sell it. One exception are low-level spellbooks: By the time the spell expires, your character is most likely either dead or stinking rich.

References[]

  1. shk.c, line 3922 usage fee
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