I feel the same way!! I never even thought of looking for fabric on eBay until I read it here. I have made 13 purchases there and another 4 or so on other sites looking for coordinates. I am at my limit for the month but I've purchased fabric for 6 quilts plus 15 other yards of fabric just because I liked them but have no specific plans.
I need to spend some time sewing instead of buying!!! I am still waiting on 8 purchases to arrive though.