Mark
CreativeMountainGames.com
Obviously, he's stating the strategy as an overview, not delving into the details of individual product lines and how they factor into it.
Older edition material obviously doesn't sell through brick-and-mortar stores (except as the second-hand market), but having the PDFs available for sale leads to them being as easily pirated as the current edition material. They obviously want to cut down piracy as much as possible.
That's neither obvious, as you twice contend, nor supported by any evidence since, first of all, all products that have been released to date have already been available and are thus already out there and, second, there are other ways to create PDFs from both past products and future products. In fact, the DDI does not support FLGSs except indirectly and through a process that regularly removes dollars from gamer-consumers that might otherwise be spent in FLGSs. Now, I personally have no problem with capitalism but clearly you seem to be arguing a fallacy.