I was thinking about the idea of having 'epic' ingredients available for high amounts of tokens (500/1000+) and even these being subject to market flood due to people already having tonnes of tokens saved (I myself don't even play arena much anymore and I still have a few thousand tokens).
Maybe for these shop items, there could be a 'cool down' period of 72 hours or so before you can buy another. It would control the rate of said items coming into the game. Obviously this is just a hypothetical but just a thought!