Since it would be Amazon doing the duping, I wonder if they are responsible for the mechanical license in the case of a cd-on-demand.

Maybe it would be possible to get a dealer's discount from them.

Maybe it would be a convenience to esoteric folk enthusiasts to have you find the rare CD they are looking for -on Amazon possibly, that you have uploaded from your own purchase- and buy it on-demand, then resell it to them with a fair profit built in, perhaps with a value-added content about the performer or personal recommendations of similar music, etc.

Many new questions and possibilities to explore in the changing music business.

Just throwing out ideas.