I had a little debate with an "audiophile" on a Sony forum. He swears there is a difference in toslink cables, glass vs. plastic. I think he's nuts for a number of other reasons. But, there is a small amount of validity to what he says about toslink in regard to "jitter". However, it is rarely audible.
People like to think that the money they spend is worthwhile, and that they make smart decisions. If those decisions are proven unwise, it makes them feel foolish, so they tend to defend those choices vigorously. It might also be the reason behind fierce brand loyaly, even to the point of feeling competitive with other brands' customers (which seems especially strong with Dish subs, as well as Ford and Chevy owners).
Wild, wacky stuff.