Your conscience is up to you. Everyone will have to make a choice as to how they feel about these.
They'll look nice next to my pressed Sapphire boot.
Honestly, this is such a great way to handle the issue. The fact that it's a reproduction is clear and obvious, it's cheap so gamers can afford to play them, and they're pressed, so the Duo can play them without fidgeting with its hardware (which has kept me from burning and playing anything on it, as opposed to the Dreamcast). It's not like the secondary market benefits the original developers anyway, so I can't see how this could weigh on the conscious of anyone except
hoarders collectors.
I can't wait to see what else you guys have up your sleeve. I'm not sure these are quite what I want, so I'll have to do research in them, but in principle I highly support this endeavor.