I'm curious if you have numbers on that or you are just assuming low yields.

I happen to know exactly how much a tomato plant grows because over 20 years of commercial farming I kept records. It varies a lot by variety and season and even how we are responding to market needs but in general I tend to get about 800-1400 lbs per 200 ft row for indeterminate tomatoes over the season. A farmer I know at lower elevation gets a lot more but they have a longer season, better soil and, crucially, water a lot more than we do -- my method cuts yield but increases quality. We use a 2 ft spacing for F1 varieties so that's about 100 plants (more like 95, but whatevs) so let's call it 8 pounds per plant = 48 lbs of tomatoes. Again, this is quite generalized and it's often way more. I also happen to know that's going to be on the very low end of home garden yields because people tell me this shit. Also, for cherry tomatoes you can get probably 60-70% more since they are very prolific.