Free: Contests & Raffles.
In migratory populations in the mountains, there is greater ability for escapement for bucks, so, you naturally end up with a few mature animals in the population.
my guess is that also after a few years after enough older bucks get into the population they will start issuing permits for "any buck", just like they do with the elk herd. This is great news because this kind of management scheme lets people hunt everyear, but, once every 5 or 6 years be able to get drawn for a "big buck tag". Just like the elk situation, this will result in the opportunity to harvest a great animal, once in awhile.