Safety is Job One when it comes to canning, IMO.
If you can grow your own produce, have access to excellent farmers markets, or have health concerns, then I think you're most likely to get a return on the investment. Or if you can get equipment inexpensively. For example, I paid $2 for one of my canners, then spent another $8 to get the manual for that specific canner, for a total cost of $10, not bad. My latest canner is a small one (holds seven pint jars) I bought at GW for $2. I didn't need the manual for that because it's the same manual I already have two of, one I got for a quarter and one that's the generic book for Mirro. I've picked up jars here and there cheap, and inherited a bunch. I picked up dozens and dozens of lids at a garage sale a while back for fifty cents a dozen. I'm covered for a long time to come! But if I had to go out and buy everything retail, I don't think I would either.
I'm getting more interested in canning the past few years from a health standpoint. EVERYTHING has way too much salt in it unless I make it myself. Not to mention other additives. Lately I'm very interested in canning beans due to how much a can of beans now costs at the store, and how much fewer beans are in a can now. I care less about the cost of canning beans now than about what's in them. It's easier to control what's in our foods if I can it myself.
