[sdwr]

I got first-hand (virtual) experience with this playing Dyson Sphere. Late-game tech requires a whole web of dependencies. Doubling from 1x <shiny item> per minute to 2x <shiny item> means doubling the entire supply chain all the way down the line. It's not just doubling the factory making the thing, it's doubling the inputs, and the inputs to the inputs.

For example, the mirror might require extremely high purity silica, made in a top-notch cleanroom environment. To produce 2x, you don't just need 2x the raw material, you need 2x the air filtration systems, purifying machines, trained staff.

Which is fine, that large footprint can be doubled! But maybe this whole process is only going to be state-of-the-art for 5 years, and after that won't command top dollar.