Legitimate Questions, Part One

When a book sells enough copies to earn a place on the New York Times Best-Seller List, it's really on one of several different lists. The bestsellers are first categorized by type of book (children's books, business, advice, etc.), then ranked. I'm telling you this because I just learned it myself. Until today I had always imagined one grand master list, impenetrable to all but the world's greatest writers. Turns out there can be like nine "New York Times #1 Bestseller!!!!" claims at the same time without anybody technically lying.

Let's stick with two obvious lists: hardcover fiction and paperback fiction. Here's my question: since hardcovers precede paperbacks as a rule, would it be right to assume that the paperback best-seller list will not actually include new releases? Or are some books never printed in hardcover, and instead shoot to the top of the paperback heap? Or is the paperback best-seller list just an extension of the hardcover best-seller list once the publisher stops printing the expensive versions?

These, I believe, are legitimate questions.