Lucky Stars has always been an event in which players should avoid like the plague in the past. What was on the Wheel however was a lot better. Most of the time you would only get 1 Star or 1 frag of a ninja. It doesn't change the RNG on it *s, just remember all your prizes are already pre-determined the moment you click the spin *on. Or go for any of your rewards.

Even Survival has the rewards predetermined cause every time you see say

Asuma Wind Blade 30 coupons Awakening Material Awakening Material Choza

You will always never get the 30 coupons. But get everything else.

I've gotten coupons and seal scrolls

10 coupons though :x

Just memorize the prize list and you can figure out what you're going to get every time.