with caves from when i used it, there had to be a rough idea of gold being spent in a certain cave to get an item/potion that you were looking for from a specific creature Ex. your Deathly Mold is dropped by Brotherhood Crusader and you need to spend 20,000 gold to have a chance to encounter this creature, dont get me wrong the chances aren't guaranteed. (not sure if you knew this or not) just trying to help
but me personally to get back on track with this post. no i do not but i know many who use it.