DC & the Big Bang

We just discovered The Big Bang Theory. Yeah, yeah we know that it has been on TV for a bit, but for whatever reason  we just never sat down to watch it. However, now that it is on TBS, we have become a big fan. We love all the geeky Sci-Fi, fantasy, Comicbook, collectible references. Plus we also enjoy that the main characters are all braniac scientists, most of whom can't figure out how to exist in normal society. Still we were curious as to why all of the comic book references were DC rather than Marvel. Then we saw this:

Bummer, eh?