Have you done this yourself, or are you just trying to score rhetorical points?
I have: my parents are corn/soy/livestock farmers on a small farm they own in the Midwest. Their friends and neighbors are all small operations as well. It's not a job you make much money at, it's true--imagine if all of your income depended on good weather and timing the commodities markets right! They stick with it because it's a job with independence and pride in producing something the world needs. Heritage and tradition, too: many have ancestors who have been farming in the area for a century or more.
It's easy to vilify something if you don't understand it.
More corn / soybean is about the last thing the world needs. It's also extremely dependent on oil prices due to the fact that most corn farmers requires heaps of fertilizer to produce corn / soy at such an unsustainable rate. http://www.scientificamerican.com/article.cfm?id=that-burger...