Suicide Girls sends out the message that you don't have to be hot or have big tits for guys to pay $4 a month to jack off to your pictures.
The Girls are usually women who used to be fat and lost the weight, but not the fat mentality. They are still attention whores, and they still use internet disease photos. Most of them have little or no boobiez, and the few that actually do, have old lady sags.
They also buy into that new age hippie bullshit that "everyone is beautiful, I'm just alternative." Let's face it: you didn't lose enough weight, your tattoos are ugly, blood is not sexy and you're a stupid cow who needs to learn to fucking wax before a photo shoot, or at least put on a facial expression that doesn't scream "Fine, Daddy! I don't need your love!"
At some point, a female friend of yours may decide that she is going to send some pics to Suicide Girls. This is code for "I'm unhappy right now and I'm desperate for someone to tell me I'm pretty, even if it means threatening to show off my cunt to an internet audience." Let her know that regular porn pays better.