Where did you get 30% from? I'm just curious since NWS data is widely used as a source for creating weather forecasts, which if I had to guess near 100% of people use in one way, shape, or form. I think Google uses it, so anyone with an Android phone is one click away from a forecast using the data.

On the matter of taxes being proportional to income, I'm not going to argue about progressive taxation or any moralistic standpoint of proportional taxation. From purely a utility standpoint, those handful of people probably reap way more value from that NWS data being available. The richest people (those paying the millions for NWS) usually are that rich from the labor of others, and those labor forces all get value from the data to help plan their days, including getting to the workplace safely. Another even more direct use for the economy would be routing of trucks through snowy passes, or planning for large construction companies.