if you really want to know, i can tell you why certain bands skip dc. the lack of a mid-size venue (like the ottobar) has a lot to do with it. things will be changing soon, however.
i know my taste in music is pretty much out of the mainstream, but since i started doing show three years ago, i've been able to bring many bands to dc that would otherwise have skipped it. if you're into experimental, noise, psych, doom metal, acid folk, free jazz, and electronics, you know what i'm talking about.