They look a lot cooler going "bang"!
Absolutely, but for instance I have three hanging on the wall to look cool. One is a toy that I bought for a foster grandson that I never got the chance to give him, one isn't safe to shoot any more and one is really just a collection of more or less broken parts that I was able to put together to hang on the wall. Where they are hanging it'd be tough to get them down and shoot them very often and I wouldn't want to put a valuable real gun there as they are in the sun room where anybody could see them. If I had, say a class III Thompson and liked the idea of having a Thompson hanging on my wall, I'd probably rather hang a $100 denix copy up than to hang up the $60,000 original. That's just me though.
Having said that I do only own 3 guns that I haven't shot. One is a Damascus barrel shotgun and the other 2 are guns that I haven't been able to find the parts needed to restore them to shootable condition.
I never much saw a reason to own a gun I wasn't going to shoot.