Why reduce death rush amethyst ring droprate so much?

4ex minimum, only 3 avaiable.
It is a good ring but still, only really good for physical builds, otherwise it's just meeeh-ish.

No one will be using it, it's the same as if it didn't exist, even if i find one myself, i would rather sell it and buy a way, way, way better rare ring for 4ex.

Perhaps nobody has decided to sell it, yet, rather than it doesn't drop any more? (or everyone who got the drop isn't in a trade league, or isn't interested in selling them on, whatever.)

If I'm not mistaken Death Rush is a league specific unique (Onslaught), which could be the reason why it is expensive, it is simply insanely rare.