While that may be profitable for Monsanto, it is horrible for our ecosystem. RoundupReady are genetically modified using e. coli bacteria to insert the genetic material. In order to verify that the genetic modification is successful, they also include the gene for penicillin immunity. Now we have massive numbers of organisms with the gene sequence necessary to be immune to penicillin, and more producers of GMO seeds means more genetic modifications in the wild. Monsanto has already come out with 2,4D (a component of agent orange) immune seed to prepare for the expiration of RoundupReady patents. It's also worth mentioning that a significant number of common weeds are immune to Roundup now.