for 100 ingots, you get 30 coupons back and then almost 2 seal scrolls, a charm materials pack, and 6 rune level 1 rune stones.
It's fine. If you're a light spender that's careful with your coupons then it might not be exactly what you want. But if you recharge enough that it's difficult for you to turn your ingots into coupons and maybe even if you're looking for a little something to help push you towards spending the 1000 ingots on the week to combo with the total spending rebate then... it's fine and maybe worth it for ya.
But, again, if you're a lighter spender that wants to be more careful with what you do with your coupons then it's definitely not a great enough value that you "can't miss" on the deal and should pull the trigger, methinks.