I mean the upside to buying a pre-sale pack is that 1 pack will count against every airdrop yet to come. It will be a slim chance on all 15 but 1 is more than 0 so you got that going for you. Another thing you can do since you don't need the pack to be airdrop eligible is sell the pack to get funds for a future pack purchase.
So if you were to say stake all your SPS before the double voucher rate starts on December 8th. You would earn enough vouchers to buy a few more packs in the next 2 million. If you then sell all those packs you would have funds for more packs in the no voucher sale of the final 12 million.
Regarding opening packs, it takes quite a few to make a full deck. @clove71 is buying 2400 or so as that is what she believes (minimum) it would take to build a maxed deck. I opened a couple hundred Untamed packs and a bunch of Dice packs and my deck isn't even a silver maxed deck so only open if you enjoy the gamble for a high value card. Otherwise, sell/hodl+sell your packs to make money for purchasing singles.
Thanks for the great advice. I will take it all into consideration for when we get closer to that time period. What do you think of the Beta cards and their potential for price increase when the new standard deck set is changed to Untamed and Chaos?