Didn't even think of a jam... I rarely ever buy a jam, sometimes (read once a year) a marmalade for DH but otherwise we're just not jam eaters.
Watch the quality if they say 'tomatoes for sauce'. I always use good quality tomatoes even for sauce. Processed (supermarket brands) of tomato sauce use tomatoes that on picking up would run through your fingers they're so rotten. I know someone locally that all of his tomato sauce go mouldy and I wondered if he started with mouldy tomatoes. I know many years ago my Mum being given 'sauce tomatoes' from a lady on a nearby farm and they were full of maggots.
You put good in, you get good out... as with everything.
If people can't eat salt I wouldn't worry about your home produced products, they're getting as much if not more from the shop! So many people these days getting allergies it really does make me look at our food and what they're putting in it.
On the subject of product used for process products, I worked at an orange juice (Mr Juicy) factory years back for a little while (in the packing shed) and you should have seen the oranges used for fruit juice - mouldy, falling apart rotten smelly oranges, that turn up after processing in a nice plastic bottle with a label telling us how fresh it is!
There's so much said about home produced food poisoning, but in Australia (not the US, which is where most stats come from) most food poisoning comes from food bought at a supermarket, take-a-way, restaurant... not from what we produce in our own homes. But that doesn't mean we don't do our very best where hygiene is concerned to ensure it stays that way.
Now I should give it a rest today, I really am far to verbose for my own good.