I easily find myself between 2500-2600 cups and It makes for me more difficult to full the raid chest since It matches me with 4500-4600tp teams and I need to Skip some of them.
Is there any advantage being in 2600+ cups? If not, I think It Will be better resourcewise to put a team on defense that barely stands in 2400 cups.
Also they could add a new arena. 2600+ or 2700+ with new and improved rewards. That would motivate the players more towards getting high cups.