From the brief contact we had with them, they said they don't offer advances for creator-owned work. From that I imagine they pay a page rate for the artists they take on for licensed properties.
I've never really seen anyone in the comics community (review sites, blogs, creators...) post about their books, so I don't know how known they are. I got their edition of THE ALCHEMIST from my library. It was full color, hardcover, book sized (vs TPBs), printed fine. I think I had some nitpicks about lettering and editing, but eh. No idea how much of my ambivalence about the book was the fact that it was an adaptation and not an original graphic novel.