I do pretty much exactly as you do. I have limited space and found from previous activities that it doesn't pay to grow too much of a stash. I love hand quilting and since I work full time and go to school it can take me up to 6 months to finish a quilt. At that rate it doesn't pay to get too much ahead.
That being said, I do have 4 shoe box size plastic bins with FQ and charms that I have fallen in love with. I justify these knowing if I need a quick all machine done quilt I have a supply to go to. I am now on a no buying restriction. Nothing can come in unless something goes out. Space and time are my enemy.