I had a lady in the other day who wanted a 16 x 20. I had some nice moulding that she really liked, but it was the remainder from a 10 piece order and I had quite a bit of it in one six footer and two four footers. Well, she didn't like the price, even with about $80 off for being in stock. I have a readymade bin, but she wanted to know what I would charge for that 16 x 20 frame if it was in the readymade bin. I said I probably wouldn't put it there as I had enough to do a custom piece with it.
Next day a good customer walks in, needs a one day project. That same moulding is enough to do his 26 x 36 frame and it's perfect. Final tag $425 for mounting, glass, mat & frames. See, if I had done her project, I would have missed out on this one.
I hoard my remainders. This is why. There's no such thing as scrap.