Letters are processed by a highly complex, multi-purpose intelligence system known as me. I accept IPoAC as long as the carriers are allowed to unionize.
I know cost-effectivness is often the deciding factor, but that's kinda sad, so:
One deer hit a day, down 91% means ~330 deers saved per year.
$15m spread over the working population (160m) of the US is less than $0.10 per person.
So you're spending $0.10 to save 330 deer, which is a trade I would make.