For me, I go by the motto of collect what you like, and because I like it, I want to see it. While there's certainly some potential of long term value in the items, that's not why I buy them. I buy them because I like them and therefore want to see them. Same philosophy with my other collections, if I'm not looking through my card collection regularly, I get rid of it as it's stopped meaning something to me. I would agree with the other statement above, if I'm just going to display a copy, I might as well just get prints of high end books I don't own that look cool. Just my 2 cents.
Exactly how I feel.