I think using Knuth's Art Of Programming as an example is somewhat flawed. It's not your run of the mill set. The only reason why I wouldn't pay you as much for

I think using Knuth's Art Of Programming as an example is somewhat flawed. It's not your run of the mill set. The only reason why I wouldn't pay you as much for the paper collection versus the hardcover set I have on my shelf is that I consider the hardcover set to be more of a collector sort of item. However, if I didn't care about it acting as a mantle piece I would still pay for the content, just not as much as I would for the mantle piece version. Similarly, some pay for collectors version of games, books, etc. However, the content should still be valued and priced accordingly. Clearly less than mantle piece versions. As I said in my previous posts, the prices should come down with the publishing costs discounted, but any more than that would devalue the content IMO.