I don't think they should hire to meet a quota or to diversify for the sake of diversifying.
Basically this and what the OP said. I'm a dude on a couch who enjoy gags spout out by dudes on couches. We are the target audience for them.
People always say Giantbomb is a personality-based website, but to me what's more important is that it is a SMALL personality-based website. Everyone knows each other, that's why it works.