Because these books are nearly always reprints, and rarely first editions, collectors often feel tepid toward them. By convention, sellers will identify them as such regardless of their condition.
Book Club Editions, smaller than standard editions, often using cheaper inks and binding materials, and printed for book club members only.
A book usually printed especially for a book club such as "The Book of the Month Club" or "The Literary Guild." These copies will usually have the words "Book Club Edition" printed on the bottom right corner of the front flap of the dustwrapper. Occasionally, if the book club does not wish to do a separate edition they will have a publisher blind stamp the rear board and print a supply of dustwrappers without a price on the front flap and without the bar code data on the rear panel.