I was exactly thinking the same. In my case I only will receive 1 voucher by the end of the presale. That means only 1 pack. So, if I sold the voucher at current prices, I would get $15 to get packs after the presale. And a 2% chance to get a Doctor Blight... I think it's too slim for me to get one, unfortunately. Maybe, I'm just better getting the money and reinvesting it later in cards or packs.