Why is data about the magazine industry so hard to come by?

To return to an occasional obsession: where are we going to get reliable data about Canadian magazine publishing? The one source we had, a bit quirky but at least thorough and compulsory, was the Statistics Canada biennial census of the industry.As you may know, Statscan has (for cost reasons) dropped that system in favour of a "lite" version that reflects the data that is gathered for other