Negative. They can be purchased with a CC. Granted, I don't have first-hand experience with actually doing it, but there's enough reports out there about these being card'able and the sudden influx of PayPal MyCash raises some eyebrows.
http://i.imgur.com/DVCUP0ml.jpgThanks - I didn't know that. I would also assume that discounted cards are likely fraudulently purchased.