Well, . . .hmm, . . . interesting discussion.
With food plots, you are tilling the soil, planting, and putting the entire thing at the risk of nature. Sometimes, there is too much rain, and nothing comes up. Sometimes, there is too little rain, and nothing comes up. Sometimes, the whole thing comes up, and grasshoppers wipe it out. Sometimes, it comes up great, and for some reason we don't understand, the deer will never come to it. Sometimes, it comes up great, and the deer or other animals totally wipe it out 5 days before rifle season.
Now, lets compare that to the average "corn feeder." You walk out into the field, drop a piece of 4ft x 4ft exterior grade plywood on the ground, tear open a 40 pound bag of corn, and dump it out on the plywood. Repeat every 5 days, from October 1 through the end of the season.
To me, that is a big difference.