Step 1: protect the IP protected seed genomes
Step 2: sue the crap out of people growing those types of plants who arent paying you. Edit: these are all soy beans including "public seed"
Step 3: increase the price now that you have a monopoly on that kind of seeds
Source: Monsanto and soy beans
Different take: seed genome is like a MP3. Piracy (illegal copying) is enforced based on IP. Seeds doing it "naturally on a farm" just means that you have grounds to sue the farmer for not stopping illegal copying.