Yo, Hi there. based on video i saw in Youtube, 8 spins for Wheel of Offering event cost 8700 Coupons(cp) /Ingots totally.

1st spin = 100 cp

2nd & 3rd = 500 cp

4th & 5th = 800 cp

6th & 7th = 1000 cp

8th = 2000 cp

# And welp the more coupon you use, you'll have higher chance to get better reward.

https://www.youtube.com/watch?v=2UrMhmyomMs