GoDaddy Domain Expirement Discount | Question

Some domains purchased on GoDaddy expire in a month.

I started receiving email with 10% off a month ago, then 20% and today 25% off,

I was wondering if anyone knew how much they would send you to the maximum just after the domain expired,

25% off today, it looked like a good deal but it expires in 1 week this coupon, I have not had a 20% expiry date.

I do not want to have it with 25% off if I can get 50% just before it expires.

let me know if anyone has any experience with that!