It's too simply too costly. I usually figure out which three gems I can make the best use of, then start casting the specific sitefinding spells like Augury and Haruspex with several mages.
I use Acashic Record mostly because I like finding cool sites I've never seen before. I never looked at the various magic-sites-lists, because I want to find out myself, and don't want to deprave myself from this "Wow, that's something cool!"-feeling. So, it's 25 pearls for a sort of adrenaline kick for me.
