Good topic (finally). Why would a woman stay with an AFC? A lot of reasons actually, but there are some commonalities.
First, there's the guy that was once the Jerk, who had been attractive enough, or played the role well enough, to get involved with a woman who successfully "changed" him. And in an effort to better identify with what she's convinced him (and herself) that he ought to be living up to, he reverts to being an AFC in the relationship. She can't complain because he's changed into what she thought she was supposed to want in a guy, but he's turned into the kind of guy she'd never have been attracted to if she were to meet him while single. So she stays with him up until the point that she meets another Jerk who she wants to fukk and eventually 'fix' him too.
Second, lets not forget that some of the most wealthy and physically attractive men also happen to be the biggest AFCs you'll ever meet. The wealthy man and the attractive man have little to prompt them to re-think their own behaviors. I once worked with this guy named Jake who was model quality good looking. He had no trouble with attracting women, and most would simply approach him, but Jake was probably the biggest AFC tool I'd ever met. He used to constantly complain that he couldn't get a girlfriend or keep a girl interested in him, even though he was tapping beautiful women every weekend. Once he opened his mouth and spilled his life story out on the restaurant table on the first date these girls would run for the hills. He literally had ONEitis for ANY girl he was dating at the time and swallowed hook, line and sinker the soul-mate mythology. He tried to be friends, tried to be sensitive, tried to be funny, tried to be savior and every other AFC technique in the book, but all this did was push these women away from him. They enjoyed being fukked by the guy, but when he started up the ice cream cones and puppy dogs, cuddle b!tch sh!t they moved on to other guys. In other words AFCs aren't all computer geeks and being attractive doesn't insulate you from internalizing stupid, feminized romanticisms.