I do not pay a lot for wires (compared to some at least) so I am not sorry I read this.
FWIW, my recollection from selling audio gear many years ago and having seen a lot of vendor cost versus sell price data is that accessories like wires and other similar relatively simple tweaks was by far where a lot of profit is made, markups of 100's of % or more, compared to very marginal profit for core electronic/component devices.
I doubt much about that has changed over the years.
Moral off the story: Buy wires used whenever possible! The used prices more reflect actual objective value and wires being relatively simple devices tend to hold up pretty well over time.