If one is concerned that the cost of improving a pair of speakers will be greater than the value of the speakers you are missing the point.
I totally agree with this statement.
We differ only on 1) the audibility of various capacitors when employed as a shunt, and 2) the idea of paying a premium for a capacitor, (purportedly 1uF greater than another), when the tolerances for each might well land them in exactly the same place.