If you use lower leveled cards compared to the max level for your league, then you may not earn as much as someone with maxed cards

Be extremely careful with how you implement this. It is looking like a punishing players for having better skill. If it is only applied for using Level 1 Cards at higher leagues, it might be tolerated.Getting the short end of the stick for the beating a massively powerful team with a weaker is not something I want to see. It is fun to have the underdog deck and still come out on top.

PS: I am playing in Gold/Diamond Leagues. The feedback is based on my experience at those leagues. I would suggest to at least wait for an SPS Governance Vote to settle something like this.
!PIZZA