They want to make money selling tickets for the tramway:
> Under the proposal, the studio would share ticketing revenue with the city to support park activities, the company said in a letter to Los Angeles Recreation and Parks Department General Manager Michael Shull and Chief Legislative Analyst Sharon Tso. Warner Bros. did not say how much it might charge for the tram ride.
They believe the tourists are causing a problem and that they have a solution:
> Several months ago, Gilbert said, he and a group of Warner Bros. executives drove to Hollywood Lake Park to observe the heavy traffic near the popular landmark. He saw one driver wave a selfie stick while trying to steer a red convertible, he said.
> “We know the problem is getting worse, and the city is looking for a solution,” he said. “We believe we're uniquely qualified. We've been around a long time, we’re local, and we believe we have a good answer.”