Lib-Dem's shift right?

Most people are predicting it, but why then is the Orange Book out of print? From The Independent:

While the authors of the now infamous Orange Book, which advocates a lurch to the right, are busy on the conference fringe, the book itself is in somewhat short supply. A sad notice in the official conference bookshop declares that the party faithful can order the tome and have it posted to their home.
So why no copies of this seminal text? "It's out of print but one of the authors has a few copies left that we can get hold of,"

Now, is it just that it's so popular that they've simply run out of copies to sell, or just that demand was so low that they didn't reprint it? The fact that 'the authors having a few copies left' does summon up images of the lonely self-publishing author, sat at home, surrounded by piles of his own book that nobody wants to buy, and are destined to become Christmas/birthday/bah mitzvah presents for years to come...