Same deal goes with canning, canning is expensive. A few years ago I calculated time(at my hourly billing rate)/energy/supplies and making a quart of tomato sauce cost me $18 each for 7 jars. I can buy them for 1 buck or 2 each on sale. But is the taste better?
Sure, in the winter I can buy cans of tomato's 5 for 5 bucks, but to open that canned jar of summer grown tomatoes in the middle of winter, oh, there is nothing like it.
If you are in it to make the money, there is some to be made, but production must be on a large scale to make any of it profitable.
For most it's the enjoyment of doing, making wholesome quality foods, sharing with others, and getting quality smoked meats or canning fruits and veggies that are to our own taste.