We don't use much ketchup either. But, homemade ketchup is so much tastier than the store-bought stuff.
I want to use pasata because it comes in glass bottles. I can get tomato paste in little glass jars at the health food store, but it is quite expensive. Even organic tomatoes come in cans lined with stuff containing BPA, which is estrogenic and I'm not supposed to eat anything estrogenic.
My niece and nephew pick and can their own tomatoes...by the bushel. My Christmas gift from them every year is several jars of tomatoes, tomato paste, crushed tomatoes and even last year HP sauce! I will be using their paste for my ketchup!
BTW, what is pasata?