I think that if you had a good year, you could do ok with 'maters, but if it turns off dry, your 'maters will get sunburned and spotty and you won't make nothing. Better to have 3 or 4 hens laying rather than counting on one to lay 4 times a day.
I still grow a lot of tomatoes as a hobby and no way would I want my income to depend on them. Too many diseases now, too much depends on the weather. If you have to irrigate them heavily you are going backwards. Plus if you grow the popular varieties, you have to stake them. I definitely would grow maters as a "profit maker" but not as my main source of income.
Around here, in addition to sweet corn, folks sell all the cow peas they can grow. The old timey varieties. We must have at least a half dozen farmers market within 10 miles of here.