Corn handling costs vary with machines used, acres operated and other factors. Early harvesting reduces field losses but may add costs for drying the crop. Here are some other costs you may want to think about.
Van Fossen, Larry and Stoneberg, E. G.
"What Costs for Harvesting, Drying and Storing Corn?,"
Iowa Farm Science: Vol. 17
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol17/iss2/2