It is really depended on RNG luck.

I got Mada10t with 4k coupons.. Some spend 60k and did not get Asura.

So if you really want it, go for it. But I rather save for Fuku Rebate for guarantee ninja.

Since froggy is this week, likely fuku rebate is next week.

Might not want to regret spending 30k this week but ends up there is something you may get from fuku rebate week.