I thought the price just to unlock for land was astronomically expensive. Making that price the full cost to unlock might be a little on the low side, but if even half of the currently issued cards get unlocked, that will burn over 750 million DEC and close to 4 million vouchers.(if everyone uses 50% vouchers and DEC)
Assuming these cards continue to be in chests for another 6 months, those numbers can easily reach to over 1 billion DEC and 5 million vouchers burned.