Do you have a huge stash yourself? I have a modest stash and I really don't need much more. I do buy backs so you might be interested if there are larger pieces. I would want to look and see what I wanted rather than buy it all myself.
As for offering for it all, that's a hard call. You don't want to insult your friends with a low price and you don't want to have too much money tied up in fabric. I also wouldn't want you have to spend weeks washing it all.