Using your yield figures, priced at today's close on the Chicago Board of Trade, wholly without regard to any subsidy, an acre of soft red winter wheat will gross $211 per acre while an acre of #2 yellow corn will gross $564. It's that corn actually has a value in the marketplace that we plant it.
The corn has a comparatively high value because
A) It’s subsidized, so it’s cheaper than it would otherwise be.
B) Tariffs on sugar prompt increase usage of HFCS
C) Ethanol is mandated, further increasing consumption of corn.