"Of course, for archiving, or when you intend to use the encoded material later for further processing, it might be smarter not to use MP3 but use a lossless audio-compression format."
- thats from your article.
http://www.u2shn.com/shnfaq.php
Edit -
http://etree.org/faq_general.html#6 (more credible site)
Why not MP3/VQF/AAC/ETC?
"These compressions all use a lossy algorithm. This means that over time, these lossy recordings can be re-extracted and re-encoded so that it sounds very inferior to the original source. Lossless algorithms such as Shorten (.shn) allow for pure digital reproductions."
Im not saying that its impossible for an mp3 to have good sound quality. Im saying that when it comes to archiving and trading, SHN, Flac and other lossless sound formats are the way to go.