Tokyopop, no matter how someone feels about the company, is the company that pushed manga to it's new prominence with cheaper prices and more variety, forcing Viz to answer in kind and other publishers to take notice.
TP creators are the most visible and recognizable in the new wave, especially since they are in print. webcomics are still alien and foreign beasties to the print industry-- except for freaks like Penny Arcade. You know, the same way manga style was perceived for a long time
And besides, the book was published by HarperCollins and produced by Steelriver Studios of which Tania Del Rio is a member.