If you've ever noticed...well, even if you haven't....corn doesn't grow as tall along the edge of a plot/field. The tops seem to be pretty uniform height until you get to the last few rows at the edge.
Corn doesn't seem to do as well when there are only a row or two. You'll only get 1 or 2 ears per stalk and with a raised bed it'll need watering even when the ground in wet under the bed.
I'd give up the corn for things that will give you more bang for the buck, more eating per square foot.
