I sort of get what you are saying. I do this with yarn a lot. I buy it because it is pretty. Then when I need yarn for a project, I can't use anything in my stash because it is either the wrong color or I don't have enought of it or whatever. Why do I have this need for more and more yarn and fabric
You've pretty much described my yarn and fabric stash
About a month ago, I tried to organize my craft room and was appalled to realize that:
1. My yarn stash just about rivals my fabric stash (and I just picked up knitting last summer...)
2. I found yarn and fabric that I never knew I had
3. I needed to buy more plastic totes to hold the yarn and fabric that was being neglected (i.e. left in their original shopping bags with receipts and all)
4. I only had 2 knitting WIP and 1 sewing WIP projects, which led me to wonder why oh why am I building this stash?!??