Expensive cables are like water in a fancy bottle. The price one pays for the bottle can range from a bit to a lot. Depending on the belief in the bottle as a plus to the “flavour” of the water and the desire for anything in art to admire.
What I personally consider a reasonable price for a sturdy 1,5 to 2m pre-made cable with bananaplugs is around 40 to 50 euros.
All cables are subject to the laws of physics. An ideal cable will have less resistance and a balanced inductance.
Poorly designed construction, may cause the amplifier to oscillate prematurely or lead to treble rolloff. Some cables are deliberately designed, so the treble rolls off, thus the topend appears smoother but less detailed.
Super crazy priced cables may appear as candy to the eyes but sonically it may not offer any real beneficts to a well designed £40-£50 cable.
I honestly believe there should be like a food label on cables, where it gives measurement of inductance and resistance and some hint of the tonality and sound characteristics of the cable, so you can make an informed choice if these cables are suitable for your amp and speakers. 😊👍