Copyright as a profession is very justified in some situations but very misleading when analyzing the results of a survey based on sample size. A further issue with the economic evaluations is that the authors used the 2002 Census data that doesn't allow statistical analysis to properly separate out the two categories. In the case of the study I cited above, for those who paid the income tax and took the Earned Income Tax Credit, it is clear that they would have had lower incomes. In oth...