I know most of the pecan trees sold around here are papershells grafted onto native stock, and understand why. I was just unaware of grafted tomatoes.
I'll stick with my Romas for bulk production.
/johnny
I’ve heard of people grafting tomatoes onto other members of the nightshade family, particularly ones that were growing as weeds already. On the one hand, it’s a great way to make your weeds work for you. On the other hand, you’d have to be careful just which nightshade you were grafting onto. There was a case I read where they had used jimsonweed as the rootstock. It grew tomato vines that were bushy, vigorous, extremely productive. . . and highly poisonous. Landed the entire family in the hospital.