I've been reading about storing dry goods in #10 cans. Does anyone have experience doing this? It looks great, but I can't figure out why the seamer/sealer is so terribly expensive. I suppose the type of people who would buy a seamer are the sort that prefer quality, but 600 $ for a hand-powered machine that is basically 2 rollers? I don't get it. It seems like it would be easy enough to roll your own (pun intended). Someone with experience should talk me out of my ignorance.