I took all my double knits to Goodwill years ago. Now I have a stash of all cottons and I am proud of it. I have always stocked up on food when I had extra money and it has always seen me through times when money was tight (and that was frequently). Personally, I have no problem building a stash of fabric when I have the money to do so. When I get ready to start a project, I do not want to have to go shopping, I want to start the process immediately.
While my stash will probably never put some I have seen on this board to shame, I am rather proud of it and continue to add to it at every opportunity. No problem here with stashing as long as I make use of it from time to time.