Again: PACER fees do not simply pay for the marginal cost of delivering a static file.

Right, but 1: We already pay for the fixed costs and 2: the real marginal cost--however you want to measure it--is still closer to 0 than 10 cents.

No, it pays for costs unrelated to serving static content. It's a use tax. The fees do not entirely have to do with paying for a website.

That’s right. And use taxes can and should be calibrated to not just collect money but achieve public policy objectives. If the real marginal cost were close to 10 cents a page, we might be able to argue that funding the system other ways would be more distortionary but it’s not. We have decided with lots of static file services (including Supreme Court opinions) that the right use tax is 0, because zero-cost access is a desirable quality in itself.