This is a nice one indeed.
Whereas transmitting digital audio through SPDIF (or similar) can suffer from jitter due to transmission - and thus can sometimes benefit from improved transmission - for "streaming" audio through ethernet? Really
(Oh and for SPDIF, you can do some kind of "reclocking" on the receiver side to improve jitter, which certainly is much less expensive than using moon-dust-plated cables.
)
(What is even funnier is the thought of people streaming lossy-compressed audio through ethernet and buying voodoo cables and voodoo switches. Of course you can stream lossless audio as well, but I'm sure among the customers of these, you'll find some that stream MP3's.
)