I'd been thinking something along these lines earlier, and the legal considerations are, of course, the problem.
But...are they really? Here in the US, at least, copyright expires after 20 years...doesn't that automatically place all the mags and softs prior to 88 in the public domain? Notable exceptions would be Newtek's Lightwave and Toaster products, Caligari's TrueSpace products, and Scala's MM-series products, as those have continued to be published thereby extending copyright date.
Am I way off base thinking this to be the case? At the least, I wonder if 'piracy' is an inaccurate term for p2p'd and fleabayed items :/