The problem is that the "AmigaOne"-stamp on the board adds cost (1), without adding any value (2)
I disagree. The AmigaOne stamp on the board does add value - firstly, without it you cannot legally run AmigaOS on the board (which is a pretty big value add, whatever uses you come up with), and secondly if you market these to end customers there is value added through brand recognition ("'Amiga?' I had one of those", etc).
Chris