I picked up one of these for about 60k for my WHM and i'm pretty darn happy with it. I don't wear it full-time mind you, it's macroed in and back out on all my divine spells (flash, banish II, holy etc) so that my flash is less likely to get a partial resist and my nukes, if I ever have to nuke to save lives, (hey, it happens) are less likely to be resisted.
/equip Ear2 "Divine Earring"
/wait 1
/ma "Flash" <bt>
/wait 2
/equip Ear2 "Geist Earring"
That's my flash macro, the first wait is to give the server a chance to register my earring change before I cast flash, and the second wait is to let the spell finish casting before swapping back to my other earring. Perhaps wait 2 is a little much but I say better safe than sorry, especially in laggy areas.
Considering they don't go for much (because "WHM's shouldn't be nuking"), if you can manage to find yourself one for a decent price and are willing to work with equipment change macro's, I highly recommend this earring for your divine work.