Hoarding is, as I understand it, a psychological condition, in which people find it impossible to get rid of anything, often as a reaction to losing someone. I don't think that quilter's fall under that umbrella, because they are buying it for a purpose, and they use it. They may not use it all, but there is a constant outflow of material. Now if you've filled your attic, and your garage, and your basement, and you don't want to use the fabric for fear you might need it for something else in the future, then yes, I would say you have a problem.
Other than that, if you think your stash it is getting too big, there is a Fabric Moratorium group you might find interesting. Or you could just send some of that lovely fabric my way
