Getting old with the GP disparity - every level is having this problem besides Kyber 1

here is an idea to "punish" sandbaggers:
don't reward everyone with the same amount of crystals for a win. put in the gp difference as a factor (maybe only if the difference gets to high, like it exceeds 10% of the players gp). so low gp winning against a big one will give significantly more crystals.