Does Plug Wire Color Really Matter?

The is something that has been bugging me for a while and I would like to hear opinions from others about this.  I have been using blue and red wrapping wire from Radio Shack for my plug wires for years and lately it seems that I have committed some sort of crime by using this wrapping wire.  I have heard this on this forum and several others that I belong to.  Well, here's the deal-

1. I find that purchasing plug wire in 3-foot lengths to be overly expensive.
2. I am not about to start stripping telephone cable or old electronics for black wire.
3. The majority of my builds are not "Factory Stock".
4. I just don't care!  If the color of the wire appeals to me for a particular build, I'll use it.

I have seen other builders use wire that is the scale size of radiator hose, and no one tells tell them it's wrong.  So why question me about the wire color?   I didn't post this because I am upset with some one's comment.  It is because I have heard this type of thing off and on for a couple of years.  I recently saw a model detailed with sewing thread for plug wires and no one said anything about it to the builder.  IMHO, the model looked great overall and I was easily able to look past the sewing thread plug wires. 

I am in no way calling out anyone nor would I ever do that.  I just want to hear some opinions from other builders.  Does plug wire color really matter?    

Source: http://cs.scaleautomag.com/SCACS/forums/thread/953148.aspx

Fred Agabashian Kurt Ahrens Jr Christijan Albers Michele Alboreto