How’s this idea for shaking things up?
Change the camp upgrade material requirement from phase to phase, but don’t tell anyone in advance. Think about it… all those players crafting Mercers to use for their high level trade camps… whoops, this phase requires Spicers!
Be a little unpredictable. It’ll force the player base to either take a gamble, be reactive, or be spread thin trying to cover contingencies.
...and meanwhile, coincidentally release purchasable flower pack special offers with the AvA builds.