How I love these type of comments - you should take the time to explain how you come up with your equivalent. I call this type of comment "the Hit and Run"
If you'd like an explanation okay as simple as this. If I pay for credits. I spend $50 that gets me 1,375,000 credits. So to get your gift card IF the credits are purchased then even doing two for $50 purchases one still wouldn't have the amount of credits to get this $50 gift card. And that's assuming they pay for credits and don't get them via auctions or some other method