I would highly recommend putting a cap on packs. Who knows you might sell a ton and then you start the game out with a mega inflation issue. Limiting packs allows the free market then to determine the price or value of the packs. Restrictions could be for every 10,000 ZING staked you're guaranteed to be able to get 1 pack for the first few days otherwise they drop into the general sale.
Just some thoughts.
For packs we don't think placing a certain supply limit is a good idea because it opens up doors for potential cornering by whales. Like if you knew there will only be 10k packs and happen to be a bored whale from hive or outside buying them all up it wouldn't be a great UX for others having to pay more to get them. This way everyone has a certain amount of time they can purchase and whales looking to corner won't have the same effectiveness. We don't think forcing a cap is good, rather provide value to the packs in other ways related to the game and rarities.