Tears of regret at all the money you've wasted, mostly. Also a certain quality of silver, but an audiophile ethernet cable remains snake oil of the highest degree.
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You know that saying about fools and their money being easily parted? Nowhere is it more true than in the high-end audiophile world. That's not to say that high-end audio gear can't sound quite nice, but once you hit a certain level, there's little doubt that you're paying badge value prices for gear with little to no discernible benefit.
Then there's the products that simply don't weigh up to any kind of reasonable evaluation, like "Audiophile" Ethernet cables.
Over at Ars Technica they're testing out the snake oil qualities of such things, but they've also taken the time to tear one apart to have a look at its innards. Apart from the slightly higher-end connectors at each end -- labelled, so you don't tragically plug the ethernet cables in the wrong way around -- and a quantity of silver wrapped around the copper wiring, as promised by the manufacturer.
Still, just in case you were wondering: Anything travelling over Ethernet is, by nature, digital. Spending extra on fancy cables might buy you a slightly more robust cable, but beyond that you're not going to get extra audio benefits.