Because I do all the time. I almost never upgrade champs outside of champion training events, preferably in a fusion that I'm going for. It's weird because I think I would enjoy the game more if I would build champs more frequently and test them out but at the same time I wouldn't like to not be able to do the champ training events for a fusion I want. I guess it's FOMO by design from plarium, cus this can be solved by just paying for stuff in the game so I understand it's working as intended but still. I was just wondering if this i s a common way to play or do other people play differently?