What's the drop rate of items from monsters in spider and golem vaults? What's the drop rate of items in other vaults?
EDIT: To answer my own questions:
59% for an undead vault (tested with around 200 kills - ghost boss version)
57% for a golem vault (again, tested with around 200 kills - iron golem boss version)
In both cases this is the normal treasure setting without the Treasure Hunter talent.
So I'm not terribly convinced there's any difference here, but I'm excited to see the results of the more extensive testing you surely did before submitting this RFE.