I will definitely try an expensive ethernet cable to see if I can hear a difference after I buy a separate DAC. I will only do it with a blind test though because otherwise it would be meaningless. I will put a blindfold on or put up a barrier and my wife can swap the cables. It will be easy to swap out a 3 foot cable between my switch and steamer. I personally don’t think I will hear a difference because I know how Ethernet receivers work. If it was not a blind test, I would introduce that bias into my listening. I can have my son try it as well. He is younger and plays acoustic guitar so he has a good ear.
In my mind, I believe it will be a waste of time because I know what occurs in an Ethernet receiver and my test won’t change anyone’s else mind because I will be told I have shitty ears or a shitty system, both of which may be true. It will still be fun to try it and who knows maybe I am wrong. We do blind tests with tequila as well to see if we can guess the brand or pick the expensive one.