I just picked up a collection of 80's books from artist Mike Vosburg who worked at Marvel in the early 80's. He mentioned that he would regularly get Complementary copies of other books from Marvel. Some of them are stamped "Complementary Copy" or "Not to Be Sold,"   Personally, I find these pretty cool as they show they came directly from the Marvel offices. There couldn't be too many of these out there.   Do collectors put a premium on these? Do people care?   Below are a few exa