Even if you're buying drugs with hard cash on a street corner, the fact remains that you would probably be financially better off by investing that money rather than trading it for drugs - hell, you could buy some Bitcoins with it as your (somewhat risky) investment if you so wish!

From the same person: "Addicts. People who need their drugs and will pay for them, despite knowing that they could buy twice as much for the same money in a week."

I don't get why he is ignoring the fact that Bitcoin could also halve in value in a week's time (errr, like it just has!), or why Forbes are quoting someone who seems to think that investing in Bitcoin is guaranteed to make you money. Or why that person is a user on Silk Road if he thinks that every week he doesn't spend on there he can double his money.