All commercial beef producers feed corn to cattle, in locations called "feedlots".
In these feedlots, cattle become encrusted with their own filth. That is the meat they serve up all over the USA.
Yes, it takes work to grow your own beef, but for every convenience (i.e., not having to slaughter your own chickens/cows, pay the correct and NORMAL price for them, etc.) you have to sacrifice something.
In some cases, what you have to sacrifice is quite a bit -- sometimes your health, sometimes even your life! There was a boy (Kevin) who died from a new version of E. Coli after eating a few hamburgers while on vacation.
This new version of E. Coli didn't exist before they started feeding corn to cows -- something cows don't normally eat.
Nature fights back sometimes.
Matthew