Champion Pass - buyable champs sets a terrible precedent
From what I can tell, this is the first time they're introducing a direct relationship between a specific champ and money. Sure, you can argue that fusion events/etc allow people to essentially buy them, but as FTP you can get those too. Might take more effort, or more require resource management to have enough to get them, but they've always been doable. Even the ostensibly highest-cost ones such as those on the different Path events were doable as FTP.
But for Champion Pass, you literally need to spend money in order to get the champ at the end. That's a really, really bad path for this game to be going down. I sincerely hope they don't continue down it, but I worry that's exactly what they're planning on doing.