the problem with sweet corn is when it gets ready, you have to move it and fast. a few days and it's over ripe.
most folks just want a nice blemish free slicing tomato. unless there are lots of folks who put up tomatoes(canning). you will only sell what they will use for a couple of days.
Produce of any type does not keep for long and you might end up with excess crops.
You need to do some research for your area and see what the market will bear.
I sell at the local market and have bought tomatoes for resale. most of the time i barely broke even when i did. Not something i plan to do again. just a few bad ones will dip into the profit margin.