Um, why are the prices so high? The only way people would ever buy GM food is if it's significantly cheaper - which it is. And if you say "government-forced monopoly keeping prices high", then why attack Monsanto and not the source of evil - government force?
And MSG makes cheap food taste yummy. Absence of MSG would mean lower quality of life for poor people, either through crummier-tasting good, having to go without other necessities to afford better food, or having to work more. MSG can also have a net positive effect on your health if it encourages you to eat more staple foods like grains and less meat and sugar.