Most listings are using an inflated number. If you actually add up the numbers they list for the actual rooms, it's usually almost half the quoted total number.
I have a lot of hobbies, and they are space consuming (woodworking and music being the most space consuming.) I would love to have enough room to feel comfortable leaving my easle set up, so maybe I would start painting again. I don't know how much of it is fear of making of a mess and just lack of inspiration. My wood working shop is WAY too small (I can't buy any more tools until I have more space and can barely move the wood around to work with the tools I do have) and I would love to have enough space for my "cello club" to meet and not bang bows. And enough space to swing a bachi would also be nice. Should I have fewer hobbies? perhaps.
Many people trade personal space for good resturants, theaters and other public spaces. Greg and I don't really do that. We spend a whole lot of time in our house. This means that we have things, like greg's exercise equpiment, that other people might use the gym for. We also don't tend to use our porch or yard, which many people use as extra living space. I feel like because we spend so much time here, it's alright to be looking for a fancier home than "just two people need."
So that's my thinking.