Is anyone buying the Xbox one x system? and why?

I will. I have a 4K TV and want to take full advantage of it, and the Xbox One X is more of an upgrade over the Xbox One than the PS4 Pro is over the PS4.

I might get one to collect with my other Xbox' s consoles.

I own right now original xbox, Xbox 360 slim, and Halo 5 Xbox one console edition.

Nope. No interest in XBox, nor do I have a 4K Display.