[Lazy_Perfectionist]

Talking about opportunity cost...

I tend to use it in games where I have death mages, but not very powerful ones or lots of death gems. Unlike, say, a Bane Blade, there's little risk of loss.

Again, its often useful in times of peace. And then, while it might take a long time to gain an experience level on its own, it may be all you need after a large battle to bump experience up a notch.