With the existence of powersaves and that device holding access close to all event pokémon already, I for one can understand that adding Gen VI Wondercards isn't exactly a priority anymore. The argument on the request of powersaves having them and the person who asked having to buy the device is, in my honest opinion, more than valid.
Adding to that the fact that as far as I know CyberGadget would be the only method of injecting said wondercards and re-saving the game, what's the point to add them then? People would still have to dish out the money.
p.s. not that it really matters that much at the current stage, but to reply on your "c", I checked the price of device+game+CGSE myself a while back and accumulated to about 250 USD or a little less for Euros. Excluding shipping.