To be completely fair though: if you consider a minion useless then,
Mounts are just as useless (typically by just playing you will eventually get a chocobo, and the MQ ends with a mount as well)
Weapon glow is useless
EXP potions / Stat Food while not useful, I think is already given in at at least some of the events
Special Dyes can work but overall still useless.

I mean nothing they can actually give will have any real use because they want events to be about fun and games, not something you feel you must do. Also, having spent a lot of time with the Brewfest to get a Brewfest Ram (Got a Kudo tho) I would rather not...have dailies for limited events...ever.