In reply to G8ADD:
I think there is some truth in that, but I have some limited direct exposure to the issues relating to visitor transport in Northern Snowdonia.
About 10 years ago Gwynedd County Council (GCC) and Snowdonia National Park Authority (SNPA) did consult on closing all the car parks adjacent to Snowdon and the Ogwen valley and replacing them with an enhanced Sherpa Bus service and big park and ride facilities just outside the Park. The initiative was called “green key”, it caused widespread complaint (understatement!). The consultation failed to get agreement on the plans.
The pricing has been set to try to deter ever increasing numbers of cars parking next to the mountains. However, one issue is people are not getting the message and just find themselves turning up at a very expensive car park, not realising the alternatives. The fees have been used to enhance parking facilities at Pen y Gwryd where you can park for £4 per day and catch a Sherpa bus.
The green key initiative lives on at the following website which you may find useful.
I regularly use the Sherpa bus service when working on Snowdon with groups. It has the advantage of allowing traverses of the mountain, permitting you to start in one place and walk back to your vehicle somewhere else, which can be more satisfying that a circular or out and return route.