I did not say anything about value. I said "it cannot be just a fad". Googling for "fad" gives me "A fad is a product that has a very brief product life".

If you used the governments aversion to meth to judge the market size of illegal drugs you would have hit the nail on its head: The worldwide market for illegal drugs is tens of billions of dollars, has been around for centuries and nobody expects it to go away soon.