Decor and Functionality
While many have stated it is spousal acceptance, I also want our listening area to look good. For example, I don't want a large subwoofer under the coffee table or located at the end of my couch. Until I finish my purpose built Home Theater room I have to live with compromises, and try to get the best sound. Even a purpose built room will have some compromises around viewing angles, speaker placement, and so forth that I will have to accept.
Compromises are a fact of life, just as I limit my spending on gear, I have to limit my placement of that gear, wish I didn't but I have to