Cecil's House o'Values

From the blurb for the book “The Straight Dope” at Cecil’s House o’Values

[emphasis mine]

If it’s the last book you’ll ever need to buy, why does Cecil have four other books for sale:[ul][li] Triumph of the Straight Dope[/li][li] The Straight Dope Tells All[/li][li] Return of the Straight Dope[/li][li] More of the Straight Dope[/ul]Just the work of marketing geniuses who never re-read their copy?[/li]
:dubious:

Fixed the title.

Maybe it should say “the fifth-to-last book you’ll ever need to buy”?

Might I suggest that you could purchase said books in reverse chronological order from the dates in which they were published. (Technically they could also be saying you should buy his first book then steal the rest, but that wouldn’t be consistent with corporate policy).

Hmm, I better remember to pick up a copy of “Shoplifting For Dummies”, which really is the last book you’ll ever need to buy (unless you skim it in-store).