If you include embroidery thread, I have a substantial amount, but it in no way compares to my fabric stash.
My quilting thread now all fits in one box, although I can't get the cover down. I'm using it all up - mostly Coats and Clark and will be replacing it with Aurofil and Superior threads. While I didn't have much of a linting problem with my brother, C&C lints terribly in my Bernina. However, I paid hundreds of dollars for the thread I have and dang it, I'm gonna use it up first!