While there is no doubt that other parts of Utah and the mountain west are just as dark a sky this award yields multiple benefits.
It garners great press and provides awareness and visibility into the issue of our dark skies disappearing throughout our country at an alarming rate. It reminds people that otherwise may be apathetic that there are places and people that treasure a natural, star-filled, sky view and it encourages others who may be interested in enjoying and preserving such skies that there are places still pristine and worth protecting. These places are out there to visit and appreciate even though our Utah metropolitan/suburban areas where these same people live are rapidly becoming like NYC (sorry NYC) where most people's experience with visible night time objects is limited to the moon and their neighborhood neon signs.
The linked article delineates multiple ways that the park service, and this park in particular, have gone out of the way to educate and inform their users and to replace/eliminate unnecessary light sources under their purview. They then went out of their way to go after the award, win it and advertise it to further the cause. Conservation and preservation of another natural resource. Exactly what I admire our National Park Service for.