Price of copper tubing!

So it might do a high PSI (still less than a 2 stage compressor at 175psi) but what’s the diameter of those lines? Pretty small right? Bigger the pipe the better the flow, just like exhaust headers and everything else we try to go big on our cars.
well, on big trucks, theres air lines from 1/16th up to 1 1/2 inch, and the line is actually rated to 200 lbs, then theres the nylon hydraulic brake line thats rated to couple 1000 psi but 1/4 inch only size ive seen of that....