I know such things are easier to do these days, and some of the old rules no longer apply, but we stick to them, I mean, a lot of cartoonists still draw using a dip-pen and waterproof Indian ink, which was only really necessary when a large wet tin-drum was still used for the printing process. So, I've balanced my pages to make the job of finding paper as easy as possible, and I've balanced the book as a multiple of 8, because that is how it has always been. And because I like things to have a beginning, a middle, and an end.
The cartoonist concerned is working on their first self-published project, so this is a good time to learn as much as they can about the process and how important dummy-books are and proper planning is. There are a number of illustrators out there from whom I learned basics and the best thing I can do is point you at their pages. Artbabe, Jessica Abel has a marvelous tutorial on her site and even though the mini I did with Dominique and Kim wasn't my first self-published project, I regularly checked Jessica's site for advice and help (it is so very easy to get confused).
Another fabulous resource is the Reproguide that you'll find free for download (scroll down to the bottom of the page), alongside some excellent books by Jordan Crane, that you should think about buying, on Red Ink's website. With advice from Ron Rege Jnr, Brian Ralph, Dave Choe, and Jordan himself, it's a must read.
You really should also check out Pam Bliss's advice and her pdf examples, available for download from Sequential Tart. I think this was the first advice I found online, and I found it very easy to follow.
More recently, I've come across this nicely illustrated piece by Coswell Productions which is excellent for anyone starting out, and even offers some advice to old farts like us.
So, to the task at hand. Again, let me emphasise, it isn't over until it's over, and now for me, for this project at least, it is over (unless I have to make any revisions that is). Here is the new, balanced, intro (if you check Euphrosene Labon's comment you'll notice I forgot to remind you of the practical use of these pages, info about copyright and publishing and previous books, etc, the usual bumf):