MY UPDATE

I went ahead and used my 1million dec to get the 500 pack special. With my Peakmonsters profit sharing and my guild discounts on potions i'm doing pretty well. Listed 2500 cards in about 1hr on peakmonsters and already sold $220 from that purchase in the last 7hrs.

There is still risk... i assume there will be some cards that just don't sell easily.
Also i am now holding dec/steem/sbd in accounts and there's no telling what happens with the values of all 3 of those tokens between now and the time i buy the next 500 pack.
So it really will be determined when i'm mostly sold out of cards and how much DEC i end up with. If it's more than the roughly 1.2 million dec to buy the packs and potions (not counting discounts from peakmonsters)