Why are roller cams so $$$?

Factory Gen 3 Hemi cams are cast, in fact they're only $80 for a replacement for most apps. And they tend to fail cam lobes at high miles and trash the lifter along with it. I'd rather have a forged or billet cam myself just knowing that.

I've been looking at a Lunati retro-fit hydraulic roller to run in a JY 5.9 Magnum and list price on their site is just under $300 for the camshaft only, I think that's pretty good...?