Waffle, the wifey should aid in the funding and construction of the man cave! I firmly believe that one's man needs his own cave. Everyone needs a little spot of something that allows them to keep their individuality, a spot that no one else is allowed to F with.
We have several man caves around here. The room that has a giant wood slot car track that hubby built, and the oldest kid turned the garage into a man cave. I had to step in and protest on the kid's man cave, some of the posters were a bit over the top-since I pay the mortgage I ripped a few down. Some body parts I just don't need to see when I walk in there!
I have my own she-man cave. LOL! It's the old little barn at the farm house. Don't have use of it right now but it is mine, it's basic, a bit rough but it is my happy place.