Defying basic economic principles?

I received new fabric ordered online today!  Isn’t it pretty?

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I’ve no plans for it yet, but saw it and couldn’t resist adding it to my stash. I’m sure it will be useful for something.  Someday.  Did I mention I really need more storage space?

I’m also fairly sure that’s not the most economically sound way to operate a business.  On the other hand, this is really more of a hobby as long as I want it to be, so I can do what I want, right?

I suppose the least I can do is startup some kind of accounting system to keep track of COGS (oooh, I DID learn something in business school!) and all that.  How else will I know if I ever turn a profit or (blech) pay taxes?