The reported number does sound pretty low since a not insignificant part of 4chan is dedicated to anime and there's got to be quite a few people who grab fansubs and read manga scanlations, both of which are clearly illegal.
I'm also wondering what the Drug User questions looks for. People who are taking illegal substances or people who are taking prescribed medication. It sure is interesting to compare that percentage to the criminal question.
There are criminal penalties for copyright infringement. You'd have to really piss off the judge and prosecutor to get charged with it for private piracy, but it's technically a criminal issue.
I'm also wondering what the Drug User questions looks for. People who are taking illegal substances or people who are taking prescribed medication. It sure is interesting to compare that percentage to the criminal question.