My feeling is brokering. Consider the market for wheat where there is pricing based on supply and demand. There are futures, options, etc.
Consider a NYSE for data. Why host the data? Be a discovery service both for the price and for brokering of access.
Data should not be priced on it's size to store/transfer. That is leaving huge money on the table. It should be priced based on what people are willing to pay for it.
Why not allow someone to pay for the option for exclusive resale rights of some weather data service? Then allow someone to make a profit off their ability to re-sale that data. etc.
You may not be well placed to do that now but someone is going to. And why would I go to you hoping to find specific data when I can go to a market full of data, full of data re-sellers, etc.