There are amateurs successfully manufacturing ancient Kodak photographic processes; given that, "insert apples into bag" sounds pretty easy in comparison. The problem is my real juicer juices better than I can likely make this machine juice with homemade bags, and to keep my carb load low, I generally eat pieces of fruit not juices so I'd not use it personally, although its an interesting challenge.
I guess the components. I think the sold the machine at a loss and maybe you could make some profit reselling some components, yet I am not quite sure.