They're trying not to have too many MMOs on the front page at the same time. There's already 4 under new games on the front page. Having too many would be a huge turnoff for users who aren't interested in MMOs.
It's all subjective to personal preference Phantom2289... personally, I don't care for MMO's so asking for more isn't preferable for me. There's already more than enough MMO's with a new one every week.
I'd like to see more short flash games being submitted tio ArmorGames if I were to have a choice. Those are the reason I joined AG in the first place...
Next to that I don't think that having a huge amount of MMO's is beneficial for AG in general, as they do make money off of them, but they also have to pay to get them hosted via contract I believe. =/
