They need to reimagine the end game rewards system. It's like a game of Goldilocks and the 3 bears. You can't be too generous because some gamers would complain the activity is giving out rewards too easily. You also can't be too stingy because gamers will become discouraged and starts to leave the game in disappointment. It has to be just right where gamers would feel at least rewarded in some form without feeling neglected. This is a tricky situation to balance out with RNG. And once you have everything, what else is there to play for? I agree with OP. Even if you already have the things you've wanted in an activity, when you repeat the said activity, you should feel like you are still being rewarded in some form or another. This is a design issue. And I think it needs improvement together with some improvement in the RNG algorithm. These two items needs to be addressed. And when they do, it may lead to a spike in population numbers in the end-game content activities. Just an opinion.