Personally, I'm kinda fed up of reading shoujo mangas (because that's mostly what I see here). Some of them are REALLY enjoyable, but some of them are cliches. I think there should be more shounen get translated, or adventure or sci-fic or action. Most of the releases I see are shoujos, yaois, or djs. If I was a translator, I would translate more shounen mangas. But unfortunately, I can't even understand a symbol.
Cuz girls are easy to please. Just throw in a hot guy, a normal girl who is often bullied, some random twist, and have them get together. If i were a mangaka thats what i would draw... Genres like seinen are so much harder =/
Also because there are probably twice as many girls that read manga than boys. Just raw numbers.