Let me preface by saying I don't personally want any of the minions, weapons, or the mounts from this event as I honestly think all of them look just awful but I want to address this point.
That being said however, I still wouldn't go for this event even if there were things I want as I absolutely can't stand doing FATEs as a player that already has every single class maxed out at 60. FATEs are boring and their main purpose has always been a way of getting extra exp while you're out questing and without that it's difficult for me to muster up the will to really grind them out even for something I want because their main purpose doesn't provide a real benefit (no I don't consider the event items a real benefit). I'd want something more substantial as a reward, my immediate thought is that if you you do a FATE as a 60 it should provide a much higher amount of gil as compensation. A more tangible benefit like that could potentially have people out in the world farming FATEs as a way of earning money after they have a class at 60.