Why are cloak batteries so stupidly cheap?

[The Savage]

Explain how you think cloaks are nerfed?
I for one think they have been buffed quite a bit from their original beginnings. What's wrong with them in your point of view?

I wanted to explain it, but @"DragonRider" was faster. It's not even for nerfs themselves - I admit it, cool, balance. It's more rather about the fact that worth of cloaks falls down, because of these nerfs.