Which fiction and non-fiction books are winners on eBay each month? This series answers that question and, along the way, looks at the listing strategies sellers use to bring in big bucks. Here are the parameters-

Each month BookThink will list the top ten high-dollar books in both the book fiction and non-fiction categories on eBay; starting with the May 2007 article, the top 5 from the Antiquarian & Collective category are included. Only books and booklets are eligible, so items like those expensive Scientology tape sets are excluded, as are book lots, multiple copies, and unpublished works. Trilogies and small sets are in but large sets are out, as are live auctions. When it comes to gray areas, the decision is in the mind of the compilers, but we'll strive for consistency.

Books are listed in the category chosen by the seller. So if a fiction book is listed in the Books - Nonfiction category, we'll follow suit. That makes for unusual instances when the same title may appear in both the fiction and the nonfiction list.

When a seller uses all caps or all bold in the auction text, we regularize it for quotes. But when a seller uses all caps in a auction title, we quote it as written.

Though dollar values of books listed in non-US currencies vary from day to day with the exchange rate, we use the dollar value stated at the time we record it.