There is only about a week of pre-sale voucher drops left. I have been saving up every one that I get with the plan to buy as many packs as possible once the airdrops end.
There will be a few days between when the airdrops end and the pre-sale ends, so I anticipate buying partial vouchers to end with a whole number. No sense in having 0.59 vouchers sitting around. I suppose I could sell it, but I'd rather get the extra pack.