That's the BEST part about the "Gold Standard"!!
At 1 BCX it's 2,500 PP and 2,500 DEC so 1:1 Efficiency... At 4 BCX it's 10k PP and 10k DEC so still 1:1 Efficiency!!
The biggest benefit for the Max Level GFL comes from Higher Tier Land - if you have a Max GFL on a Common Plot vs a Legendary Plot - the PP boost is very different!
RE: Land Worker Strategy - Efficiency Standards aka "Bang for your Buck"!