Not entirely all about profile pics, although it helps to at least have a couple up on your page. There are plenty of normal girls on there with regular camera/cell phone pics. They don't have to be model shoot pics, all of the pics I've got on my page were from either a normal camera or my or a friend's cell phone. Maybe one is from my D90 but it's not necessarily any better than the rest.
Nihon, put up more pics like I mentioned yesterday once you have them, it'll help. One headshot usually makes people think you're hiding something. (Like when you look at a girl's profile and all you see is her face, what's your immediate reaction? Probably "I wonder what the rest of her looks like")
Keep at it...
Exactly. At worst you spent a little time sending out some messages. It's like when you start a thread on GAF and 500 people read it and no one replies.

(That's happened to me way too much in the past)