How often do people get unique items from monsters?

By my thinking, a unique item is retreived once from the monster. Once that
happens, the item will be in circulation until someone sacrifices it, or it is
destroyed. The chances that it gets sacrificed are pretty rare, right? People
are more likely to take the item for their own use. If the item is restricted
by alignment, people may find a reason to sacrifice it. I think the absolute
best benefactor of good item circulation is the BATTLE cabal
because they sacrifice all magical items.

Unfortunately, item circulation isn't always healthy. To encourage healthy item
circulation I propose that the best items are hunted. A hunted item would have
to be really good, because the item provokes random encounters with powerful
monsters which try to retrieve the item. I don't think people should die, but I
do think that these monsters should pose a serious threat to an unprepared hero.
Upon pounding the victim into submission, the monster would paralyze the PC
and then steal the item (to be returned to the mob who origionally had it). This
system would work like the current Nightgaunt system works.

This system would inevitably kill people. While encounters would be rare, and
random, some would come when people are already fighting or pkilling. For
the most part (unless someone always pks), the heros would only find the
encounter challenging. The hunting monster doesn't want to kill the person,
only steal the item. The person would only die if they continually flee.

Bring on the Ringwraiths