Cost of the seed itself is a minor part of the cost of producing a crop. Once planted, it costs just as much to produce and harvest a poor crop as a good one. It's part of good management to start with high-quality seed.
Grabe, Don F.; Smart, Marvin L.; and Everson, L. E.
"Oat Yields Depend on Seed Quality, Too!,"
Iowa Farm Science: Vol. 16
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol16/iss8/5