You don't need to give me an answer, but why haven't you hung any prints in your house? If it's because of her, you should hang a few of your favorites immediately. That's the least she can do.
It sounds like the "photography isn't art" comment really bothered you, as it would me. I don't consider myself a fine art photographer, but photography is a form of expression for most of us, and that alone makes it art IMO. For her to say it's not shows that she hasn't put much thought into what you do. She doesn't have to like your photos, but she has to respect your passion for photography. If you haven't already, I suggest you have a serious talk with her about this whole thing. Not to be dramatic, but people have gone to counseling for stuff like this, so I wouldn't downplay it's importance.
I can sympathize with your situation, although it sounds like my girlfriend is a little more supportive than your wife. She loves the photos I take of her cat, and since my money is not her money, she will always encourage me to buy something I want to buy. But often times when I hand her a print she'll say, "oh cool" and hand it right back with out taking more than a second to actually look at it. That bugs me, but I can usually let it go, because it's just not her thing. Where I run into trouble is when I want to spend an evening developing and scanning and she wants me to sit still, on the sofa, watching crappy TV. My biggest beef about this situation is that she has nothing she likes to do as much as I enjoy photography. But as long as she is supportive, I can't really complain.
Paul
