Chaos Zakum, how hard is it?

Horntail Pendants sell for what, 300 - 500 million? And this helm is better than a Horntail Pendant so around 500 million+?

I thought HT pendants cost that much because of DC hackers making runs hard and HT being level 180. CZak isn't as hard as HT and you can do it on more channels(?), so it should / could be cheaper.