#10 is the first Vertigo book, being v15 of "Fables" and placing a bit over 12k copies. (v14 is at #16 with not quite 9k) Interestingly, to me, v1 only has about half of that (6797) -- I'm used to seeing much more of a bell-curve pattern on active and ongoing series (witness "The Walking Dead" or "Naruto")
Vertigo also scores with "Sandman" v1 at #11 (and almost 12k copies), and somewhat surprisingly, but completely awesomely, "Daytripper" at #13 (just under 10k) Vertigo represents almost a third of DC's placement in the Top 750 (32 books place) for about 173k, and $3m.
More generally, 11 of the 16 "Fables" books place in the Top 750, as does the hardcover of v1, the "Peter & Max" prose book, and the first volume of the "Cinderella" spin-off. Only eight of the ten "Sandman" books place, but that's because they're smack in the middle of a reformat right now. Also placing: the first two volumes of "American Vampire," the first three of "Unwritten," v1 of "Preacher," and two hardcovers and three softcovers of "Y, The Last Man"