reason of my request: these are the only rings one can craft (and the only level 63 rings in game). yet i don't like that one of the stats is totally wasted
the main purpose of the ring is to give exp bonus. so characters below p100 shouldn't be allowed to wear the ring without it (exp).
to sum it up; i believe it should be like this:
the (p100) ring can be crafted by anyone that is able to craft a normal hellfire ring. yet only p100 characters can wear it. and since it is account bound no one can make one and trade/sell them.
the ingredients shouldn't change too much though. the addition of a single brimstone to craft the "p100 hellfire ring" sounds just to me.