Black is a timeless "colour." Moleskine notebooks are equally timeless. So it makes sense that everyone's excited about their notebooks that come with all-black pages.
Intended to be written on with fluorescent gel pens, it's possible that the only people who actually buy these notebooks will be 13-year-old girls and avid scrapbookers. Even your high school home economics teacher wouldn't have accepted papers like that. But even with that all said, we still love 'em. [PSFK]