That made me smile - you really don't know a lot about drug manufacturing, do you?
A couple of points:
1. The war against drugs may not seem very effective to you, but it is in its own perverted way: punishment is
harsh - add to that that the kind of people who would attempt something as complex as that (brainy people who often have sth. to lose) would get raped in prison on a daily basis. Just look at the Aryan Brotherhood - depending on the scale of your undertaking, they are the kind of people you would be in a cell with. Don't underestimate this as a strong deterring factor.
Another interesting article on the excesses of drug law enforcement and the history of drug prohibition:
http://michaelpollan.com/articles-archive/opium-made-easy/
2. Who say there isn't such a movement? Somebody already mentioned marihuana growing, but there was at least one very high profile webforum that discussed these matters:
http://en.wikipedia.org/wiki/The_Hive_%28website%29
3. Precursors and apparatus are expensive and hard to get (in Texas you can't even buy glassware without registration).
4. If you are making drugs for your own consumption, you want them to be safe (for example free of unhealthy precursors) - the analytics are even more complicated and expensive than the manufacturing.
5. Everybody can turn on you - hiding an undertaking of that scale would be nearly impossible if you have a social life (friends, family etc.). As I tried to point out above, you are literally taking your life in your hands when you are working with these things: whom would you trust with your life? One wrong word from a drunken friend and "the conseuquences will be never be the same". You are moving into a war zone and your loved ones with you.
I think the future lies in biotransformations - candian scientist apparently have alread done it for yeast:
www.bluelight.ru/vb/threads/493629-Canadian-scientists-create-morphine-producing-yeast
Such a system will completely destroy both the drug market and prohibition. People will simply cultivate their drugs in yeast in the forseeable future.