I have a box and I don't want to have any more stash than what can fit in that box. It's a pretty good sized box -- it holds a decent amount of yarn, enough for several future projects, although at the moment I have more than it can hold.
Once I've used up the Red Heart Super Saver (those skeins are huge!) I'll have room for lots of other yarns.
I'm a scrapbooker and I just don't want to have a yarn stash that rivals my scrapbooking stash.