The problem with the hentai side as I see it is that the content is mostly stolen - and the surfers know this. Therefore paysites are identified as thieves almost universally.
From what I know, japanese manga and anime is immensely more popular than western style cartoons/comics but you have to offer the surfers something they can't find through their own fan network.
Which is pretty hard
MMG anime is offering some good stuff, and uh... so am I