Along the same lines as Artboy99...
Brittle pages are best avoided. But as noted above in this thread, the rarity of the book may provide a good reason to go forward with brittle, if there isn't anything else out there, and if there's no reason to crack it out. Such as Artboy's Planet Comics 5. Such as Jumbo Comics 9, with just a total of 9 copies on the CGC census, and only 7 universal/unrestored copies, the highest being the recent Berk copy at 7.5, then 7.0 (1), 6.5 (1), then mine at 3.0. It's a brittle book, and you can see the chip in the bottom left of the holder (which has been there at least since 2016, when the book was sold at HA, and given the old holder, was probably there for a good while before then). As someone else noted above, the CGC graders probably knocked down the grade for the brittle alone; otherwise this book presents with great color and looks more like a 6.0 (maybe?). Anyhow, without further ado, a case for brittle...