The buses were paid for by the regional development agency. When the grant ran out the bus stopped as it isn't / wasn't commercially viable. This whole public transit issue is not relevant. Over 90% of pax come3 and go by car and the end result is there isn't enough air traffic to make things work, its got bog all to do with anything else.
Airports primary purpose is to shift pax to where they want to go at a price they willpay whilst producing profits (not loads) for airlines. It just isn't happening.