I have no insight into the actual company's thinking, but in general there's not necessarily any relationship between the cost to provide a feature of software and the amount that is charged to use it. It's usually more about willingness/ability to pay. If most of the people who need access to the raw data have a certain use case that means they're willing to pay for the expensive plan, that's a good reason to charge for it, assuming your goal is to make money as a business.