Still doesn't make much sense tbh...I do do my own crumbs and freeze them if I happen to have any white bread, but very rarely use them so they're usually a victim of slingitoutitis when I defrost the freezer.
It used to happen more as I'd make a white loaf when the boys were coming, then crumb what was left after they'd gone.
The box sits in the cupboard and they stay nice and dry, and are ready if the once-in-a-blue-moon fancy takes me. At 99p for at least a year it's not exactly spendthrift is it