What they'd need to do is either tweak the crystal tower raids to take longer. Nerf the others to be faster. Or alternatively add scalable rewards.

If you clear ct raids then maybe you get a million exp bonus at the end.

Cleat ivice raids in the roulette and maybe you get 3 million exp bonus or 5 million for near raids.

Scale the tomes to. Crystal tower raids the basic 50 tomes.. nier raids could be 150...

If it takes triple the time then dish out triple the rewards. Kinda thing.

Would at least reduce the amount of players who bait the roulette by dropping ilevels for the sake of speed.