My point with digital had more to do with jitter (which can also be caused by a number of other issues besides cables).  A bad digital cable can cause all kinds of problems.   
Normal home audio to me is NOT McIntosh amplifiers (
McIntosh | Home) and other high-end stuff.  I'm talking about off-the-shelf packages from WalMart or Target mainly when it comes to my definition of normal.  I personally don't have one of those systems, but then I'm not normal.  I'd say that the higher-quality stuff does require better cabling to a degree.  But a LOT of cable talk is just hype.
Then again, if YOU hear a difference that's all that matters.