If it scaled off the Team Level, it would be appropriate. Indeed as CW does.
To be honest though (and off topic) so should Prize Wall… What was done specifically for servers not at the 270 (now 275) cap… should be done for players that are at like… below TL 200. Those are unlikely to reach TL 250 anytime soon and therefore just lose on diamonds.
Meanwhile the top… I don´t say everyone has it easy, but if you time it well, you can get Prize Wall hero to 250 and Y0 no hassle. Which is sad, really.