They "accept" everyone initially. Compared to the girls on there..... It is likely that time and gravity has placed you outside the margins of what they deem marketable to their target audience.

People still try to be Suicide Girls?

Out of the 4 sets I've shot, 2 had hiccups and have been rejected but after some editing and rearranging of the photos they were accepted.  Most of their complaints were that there were too many "filler" shots like if they were going from pose to pose not the actual pose shot.  But like I said after some editing and rearranging of the set they have been good .

Don't shoot for Suicide Girls.

Well don't commit suicide. Why not ask them?