I would think that the scalpers would see that gold EU coin that comes with the Darktrooper and scoop them up on that basis alone. I've still yet to see one at retail.
I thought the same thing. Most "scalpers" probably don't know the difference, so it seems that they would grab the Darktrooper. I'd be willing to bet that Darky is actually harder to find than a lot of the UGH due to his troop building potential.