I read with all my decks, regardless of price or current value. My Greenwood goes everywhere with me, and my Legacy of the Divine (LE) gets shuffled mindlessly quite a bit because I just love the way it feels. My Vieville has been battered, but I just call it part of it's character...it's been loved.
If I'm not going to use it, then I don't see the point in paying a ridiculous amount of money for it. The Greenwood was a gift, so I can't really use it as an example, but the Legacy I paid out of pocket for. Why pay almost $400 for a deck just to have it sit there and look pretty? Might work for some people, but not for me; I'm a reader first and foremost, not a collector.
That being said, I do try to be careful with all my decks, no matter how much they're worth. Clean hands, no fresh lotion, clean surfaces on a spread cloth, no drinks nearby, etc. Although they're just paper with pretty pictures on them, they're tools, and I want to keep them usable.