Yes, I can see where putting them out could be a problem. I have mine hanging near the fish tank, so it's out of the walkway.
It would be cool to have all of them, but like you said, it's expensive and then there's the issue of where to put them. I have a vaulted ceiling in the living room and it would be cool to have them all up like a big dogfight, but I think if I did that, I'd be in the doghouse indefinitely!