This is a valid point. The ongoing of education of the benefits of Marijuana is very important. There are many things it has uses for - Sativa alone has over 5000 medical uses and over 25000 other uses, for everything from paper to carbon fibre, diesel to clothes and everywhere in between. It is an amazing thing.
If marijuana was ever legalised, it would cause a massive global redistribution of the wealth, everyone would be on a more level footing, and that is why it will never happen.