I recharged 3000 for 6 days during Minato event and got mostly coupons some cave keys and purify runes ,2 susano frags /day.On the last day ,I recharged 8000 and got 2 susano frags,some cave keys and a lot of purify runes.My conclusion: recharge wheel event gives you about 25% rebate(coupons and items;coupons decrease and items increase with spin count) and about 2 frags/day .ps:500 coupon is super rare,100 is rare, 50 medium rare, 20-30 common.