dcollins said:As previous poster said, they're guidelines, not rules. When the DM invents new items they're first supposed to compare to an existing item. Only if that is fruitless should the table be used to get a base estimation.
My fault, I should have been more careful in my post. I merely added that page reference as an extra resource for the original poster; I wasn't trying to disagree/argue with any of the other posts. Sorry for the confusion.