This is simply incorrect.
The locals rely on the tourism that these national parks draw to the local economies. That they would ever not want customers to show up because they want these national parks (which they see day in and day out for twelve months a year) all to themselves is absurd.
(If you want to say that the park rangers on the GS salary who are paid the same regardless of how many people show up at the gate don't want a lot of visitors, that might be true.)
The posts I see from the Colorado people are very elitist .
Very much thinking the parks are their personal playgrounds .