Originally Posted by flyerCO

For reference.

DL give 4 coupons in your My wallet each time you hit a higher elite level. Thus if you go from base to Diamond in one year you'll end up earning 16.

DL gives current elites 4 coupons at start of year, regardless of elite level. They then give out 4 more as you reach a higher than current level. This means Diamonds will only earn the yearly 4 as there's no higher level to reach.