There is a lot more to avoid than that. To improve the sound, some people have frozen their CDs, put green ink on their edges, exposed them to magnetic fields, etc. Anyone who has even a basic understanding of how CDs work, and who has some reasoning ability, will realize that those things are all ridiculous. However, just do a quick on line search, and you will find advocates for all of those things, and many, many more silly and idiotic ideas about audio. Really, there is an amazing amount of nonsense associated with audio equipment. So much, in fact, that I sometimes wonder if audio equipment attracts people who are mentally ill. It certainly does not seem to repel delusional people.
With Bose, although their equipment is often cheap junk, they actually do something. Buying Bose is less stupid than what some people buy. Compare buying Bose with something like:
http://www.gcaudio.com/cgi-bin/store/showProduct.cgi?id=190
At least Bose speakers do something, even if they don't do it well.
And for crazy priced wire, Monster is a mild example. Just do a search if you are interested in finding wire that is so expensive you could buy a luxury car for the price of enough of it for a typical home theater.