First, I agree they devalue their products too quickly.
But Revan was beatable before this. I have only lost to revan in offense once. (Out over well over 50+ battles, and my loss came when I tried to take out a second revan team-and I made a mistake). I have 2 separate teams that can take then out and one of those teams is no where close to arena quality mods. (Do my teams hold? No. Does revan hold better definately appears so.) Obviously their ppl are at different points in the game, I would bet that a 750gp member with revan has little competition, but at 2M plus has counters or can build counters and that is healthy. I find more irony in the fact they they nerf raid teams after ppl have invested in them because they think it is u healthy for one team to be able to do so much damage....then they release a very epensive character that puts up massive numbers. (I am not against this, just don't like the inconsistency)