Have you ever fed yourself completely from your own garden? That is very hard, back-breaking, dangerous (if you use machinery) work (albeit definitely rewarding). My grandfather was a dairy farmer and was missing part of a finger, knew more than one person who rolled a tractor, and at least one person who was pulled into a hay bailer.

I’d wager the marginal returns from moving beyond feeding yourself for free to feeding a nation are slim, to none, and very likely negative.