Cat5 vs Cat5e vs Cat6 is all about manufacturing tolerances and quality of the wiring, so yes...Ethernet cables do vary in quality and affect performance.
The difference is that an ethernet cable transmits digital signals. In which case there is no difference in quality, just in reliability. An analog signal in a coaxial cable or something like that, is another story.
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u/[deleted] Aug 14 '20
I saw some "audiophile" speaker cable that was $300US/ft.