I think the prices of those magazines has a lot to do with advertising and circulation... Look at say, Popular Science today compared to an electronics hobbyist magazine like Nuts & Volts or Elektor.
One thing we really need is a huge cross-reference index to all those Amiga magazines. I have a couple swiped off the web to AmigaWorld & Amazing, but that's about it. I should think about OCRing the contents pages of all those scanned issues out there on the TerraBook.