SSC_Nerd
Super Freak
I am fine with them being online play only but that's because it fits me. But I am sure if they make offline and/or private network play, they can gain more sales. And this online game require broadband connection and not any internet connection. On the otherhand, maybe their offline sales isn't as strong, so they eliminate it all together.
I think it's simply because offline play would allow manipulation of the game files, and they sure as hell can't have that happening when the real money auction house exists. Simple as that.