What's the Deal With Staff of the Dreaded Gaze?

[thebutthat]

In theory, it's the trinity of the soulwell staff, epic, and this staff that gives a necro an impractical means to mana free fear kite. Given that, with the staff rarity is what drives this price up I think. I'd be interested know how many people actually go out and buy the staff, considering a necro is already monstrously efficient with mana regen, splurt, undead charming.