> Monsanto already make a killing selling Roundup,
Your information is extremely dated. The patent for Roundup expired over a decade ago, and in the last 5 years the market has been flooded with cheap chinese made Glyphosate.
Everything you wrote is completely confused. Monsanto doesn't invent a new strain of herbicide resistant crops every year. Roundup doesn't change. It is a trade name for a chemical with an expired patent, and many different companies make it.