How important is a map's Skybox?

[Terran]

That broken skybox was total cancer. A black void would be better. This sounds like a good idea all-in-all, to be honest. Simple and hey, if it works and helps people, go for it. I honestly don't understand how people lag on Gmod, but not everybody has a $50 GPU I guess. Solid plan there old chap, I'd be game for it for the freshies. Er, the nakeds. Er, the newbies. Too much Rust for me.