Kill always costs 10 crowns per try.
Some exits cost money to use, others give money.
Looking at the exit will tell you how much it will cost before you use it.
Looking at an exit will NOT tell you how much it will give you.
@link - 1c (if you own it, 2c if not).
@open - 5c (6c if linked at the same time).
@dig - 10c
@makegroup - 10c
@create - 20c
@find, @owned, @stat, @count, @exits, @entrances - 25c