More than 70% of Colorado motorists who registered or re-registered their vehicles over the past eight months opted out of a new program that allowed them to buy a state parks pass for $29. Still, as of Sunday, Sept. 10, more than a million Keep Colorado Wild passes had been sold through the state’s Department of Motor Vehicles, generating upward of $30 million in revenue for Colorado Parks and Wildlife, which oversees all 42 state parks.