Wow! I've been in fabric rehab for awhile, with my stash not growing, so feel I have a right to contribute to this thread.
In my case, I simply stopped going to fabric stores and stopped looking online (had stopped going to garage sales several years ago). That has helped a lot!
What strikes me as unusual about your case is the multitude of unfinished quilts. I think you need to learn how to do binding and then warm your heart by finding people/charities who can actually use your quilts. Maybe find ways to display some of your quilts in your house too.
Concerning binding, here are links to my favorite method by Leah Day for completely machine binding quilts (much faster than finishing by hand):
http://www.youtube.com/watch?v=wprg5vzkuGw
http://www.youtube.com/watch?v=7MRfA...eature=related