I hear where you're coming from. We have another band this year called Soul Candy, local.
There is also A-Key Kyo who love playing at Kumoricon and have done it for two years in the past yet, for some reason, have not been asked back since 2007. I don't know why they have not been asked back because as far as I know relations were great on both sides and everyone loved them. They were great at working the crowd, being energetic, and it is a shame that they have not been invited back. They would definitely be willing to play if asked. (Sorry for the rant. ^_^)
But I agree, it would be really nice if there were some others involved this year.