I try to keep my sealed copies sealed, but it *is* kind of a pain having multiple copies of stuff.
Oh, and I was re-reading my above post, and I think I used ambiguous wording. The $5 was for the shipping/handling, which was amazing compared to the shipping some jokers charge (thanks brian817!), and the cost for the 14 items was ~ $80, which I think is also quite good, given that some of the items were pretty rare (Ulysses, Dragon's Eye, Mindshadow, etc.).
I always liked EA manuals and packaging, so I hope the recent winner of the sealed MULE has access to another copy so s/he can look through the material.
Even though some of the Atari 8-bit sale prices seem kind of bizarre to me (relatively obscure stuff going for < $10, and common stuff like the Demo Cartridge selling for > $50), that's part of what makes it so fun, I think. You never know if a given auction will be your lucky day!