If a team wants to implement coupons there are basically three big questions:
Who gets them?
How do you earn them?
Settling in a $12 is basically just enough for the weakest team to offset all of arbitration (if they only receive $11, which rarely happens).
In this case I wanted the coupons to be more about activity/engagement than parity. Activity and parity are related, but parity is tough to legislate and engagement does most of the work for you, so my thought is that making the same level of coupon available to all teams allows them to be indifferent: both the good and bad teams know what they have to do right from the beginning to maximize them, and it's completely up to them to manage towards them or not.
The big lesson I learned in @Brinksmanship this year (coupons and prizes) is that when every team is heavily engaged, it makes the waiver wire so thin that it really levels the playing field for all teams, which is a blast, because it forces all owners to search even harder for value and scrap just to hit 1,500 IP (example), even if your final 100 IP come in at sub-4.00 P/IP.
That's the kind of league I really enjoy. Hopefully this AB/IP threshold setup will deliver that.