Would make sense, especially for unique patch cards (but likely not for other cards). Another thing to consider is that most of the materials for patch cards is readily available. Thus, if you were looking to forge a patch card that showed the edge of the MLB logo (or whatever) you'd just clip out the same portion of the MLB logo for your forged card. In any event, I think QR codes present a lot of possibilities to traders.
Always looking for Verlander, Cabrera, Maybin, Mike Stanton (marlins), and Avisail Garcia.
*TRYING TO COMPLETE MY VERLANDER ROOKIE COLLECTION. 44/47. ONLY 3 TO GO!*