I always get email offers from Godaddy. I have been using their offers to get a discount on domain renewals. What I have observed before was the discount Godaddy offer does not cover several domains. Say, if the offer is 20% off, you will only get the 20% off on the first domain on a multiple domain renewal. So I just use the promo code only on a single domain renewal. I did not make a fuzz out of it.
It is very clear that the promo is for any purchase from Godaddy. I almost fell on their trap but I always try to calculate the discounted price and compare it on the price on the cart before checkout.
Can you spot the fraud? I will not say anything more.