I stopped selling on the market and rent a couple of buildings. Outstanding cards still sell for reasonable prizes.
My CBM is 0 after the events, because I spent it on restoring the buildings and "finish now" to win Hive in the events.
If you don't use the finish now you could really increase your CBM.

The Excellent en Magnificent ingredient cards don't sell well on the market, but you can save those for Excellent or Magnificent beers to sell.

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