Yeah that's my attitude as well. I grow the things that are significantly better straight out of the garden. The best tomatoes are too fragile to go through the sorting machinery, so growing your own enables much higher quality produce. Berries are way better picked ripe. Green beans are also super easy to grow and are better fresh.

Then there's varieties that just aren't popular enough for many stores to stock and specialty stores are far and expensive: patty pan squash, molokhia, ground cherries, shallots, celery leaves (I don't like the stalk), a variety of herbs, peppers that aren't bell or jalapeno, etc.