I think a lot of therapist throw up their hands when it comes to treating avoidants. They try any silly thing they can. I had one suggest using some kind of heated rocks placed on my chakras during therapy, you name it.
The one that seems to be working is someone who specializes in children with attachment issues, and who also has worked with PD's. I frustrate her though. She has been phasing me out, dropping my schedule from twice a week to biweekly, and now has suggested email only therapy. I can see why - it's hard to work with someone who basically can't make real progress, who is trying to learn to live with what she wants me to forget about.