Blood Boon doesn't save jack sh*t, it's pretty worthless. The only time it's useful is in regards to the Caller's set bonus activation which augments it with a damage bonus when blood boon procs. However, all tests so far have indicated that adding gear that increases blood boon proc rate does not increase the rate at which the set bonus will proc. So basically, worthless.
So with all the people using the Blood Boon earring / etc, are they wasting their time? Are there better items for those slots? Perhaps something that grants other types of bonuses? In the short time reading up on it, everyone seems to think it's the best earring for the slot, and diabalos rope is very popular for blood boon reasons as well.
Would one be better simply using refresh, or straight HP or MP + gear in those slots, or is there something else you should be looking to fill those slots with (I'm assuming haste doesn't benefit summoners except during actual summoning).
From the quick overview here it seems one could get AF3+2, some common -perp gear like the ring and elemental staves and be pretty well off. But what would a person use in those other non -perp slots if not the Blood Boon items? (particularly in regards to the belt and earring, but also the other ring slot)