> Usually you can use your own seeds from your production for your next batch.

I'm sorry, that is simply not true. Yes, there are so-called "heirloom" varieties that come true from seed, but commercial farming in the United States has been relying on hybrid seed for well over a hundred years now, and hybrids in general do not come true from seed.

Seed production is a highly specialized form of farming.

No large-scale farmer saves seed for replanting.