Generally I am not a hoarder, more known for getting rid of things than keeping BUT, DD got me back into making and doing a few years ago, plus DH, DD & self set up a hobby business selling at antique fairs, which means going to auction sales, and inevitably bidding on Lots, usually fabrics, not for the business - but because they go so cheaply!
Even DH returned from an auction with a huge plastic box full of knitting wool. His explanation? It was so cheap! I have managed to sell half of it on ebay but I am using the other half up knitting for charity. Our local homeless hostel is desperate for warm hats, scarves, gloves and sweaters, so I am knitting my way through that stash. Similarly charity shops can usually sell crafts. DD makes lavender bags and cushions, she gets cushion pads cheaply online and her local charity shop is delighted and they sell well.