Great post!
Thanks for sharing the news, did not know they were going to release mining only cards. The issue lies a bit in that i personally like to buy cards, mine for a while and then build gaming computers to sell at the right conditions.
So while i originally can follow this equation:
mined coins profit for x time + resell value of components - original investment - electricity cost = ROI
With these cards an amendment needs to be made to the equation, namely:
mined coins profit for x time - original investment - electricity cost = ROI
The lack of a display output puts me off a bit for that reason only, but it would be interesting for perhaps building a 100% miner.
Your confidence needs to be high in the longevity of PoW systems though to invest in such a thing.