Its all about reliability, shielding and tone... but then its also about diminishing returns and personal preference and personal ear sensitivity.
A really cheap cable compared to a low-medium level cable - I think it makes sense. Quieter? That's good. Doesn't cut off treble as drastically? Sure, why not? Costs $50 for that 10 ft cable? I can live with that.
Going from medium level to WHY-THE-HELL-IS-IT-SO-EXPENSIVE?!? level might not make sense to... most. The differences become less apparent... some can't hear the difference... some think the difference isn't worth it.... etc etc