To me it sounds like a way for them to prevent people with lots of $$$ from immediately buying all the presale packs, because you need 1 voucher to buy 1 presale pack and only way to get vouchers is to stake SPS, so even people with lots of SPS staked will be limited to how many presale packs they will buy, and people who have a little staked will at least have a chance to get a few vouchers and buy presale packs. It just seems like a way to slow down the purchase of presale packs for a slightly more even distribution, rather than the richest players buying all 1 million presale packs on day 1....