Copper has a price. A length of copper with a certain diameter costs a certain amount. That amount (without connectors) scales linear with length.
So a 2x 6mm² (9 AWG) is a fat heavy cable, and it is expensive because the copper is expensive (6€ per meter/3ft). You need that conductor when pushing tons of power over long distances to big speakers and oply then!
For normal use cases, 2.5mm² (13 AWG) to connect a 200W speaker to an amp is plenty.
Analogue cables, between mic, guitars, preamps, DACs, etc., there is very minimal current flowing. So even a LAN cable with its measly 0.22mm² (24 AWG) is PLENTY (there are splitters to push multiple mics through a LAN cable as analogue signal).
So, with that puny conductor, you are looking at 1€ ($1) per meter (3ft). Add good Neutrik, Hicon or Cliff connectors (2.50 bugs a piece) and 6€ for a finished 1 meter cable.
Everything you pay beyond that is snake oil in barrels!