I've spent by my estimation somewhere between 150 and 200k coupons on lucky stars and never got a jackpot. And it's not like I have bad luck, most players don't win the jackpot either, the winners are a lucky few.

You'd be better off saving up your coupons to the 30-35k range to complete a full fuku rebate. Lucky star wheel is still one of the best events to spend on for the majority of the players, so you can do that too, and who knows, you might get lucky. Just don't expect it.

Do all events with jackpots for the other stuff that you get - not the jackpot itself.