I needed some odd audio cables last year, so that I could patch an mp3 player into a PA system. I was thinking that I'd find crimp-on 1/8" ends, and make the cable myself.
I got to the store, and was having trouble finding what I wanted (I found solder-on, but the crimp-on slot was empty), so I thought I'd look at what cables that they had that I could cut up ... and they just happened to have a cable that was 1/8" to bare wires.
The year before, I got a bunch of various cables so that I could patch into a mixing board to record audio from a conference that I was at. I've had other times when I was outfitting a chase vehicle for a solar car race, and they had the parts that I needed to get all of our various antennas on the roof of the van.
So yes, it helps for those 'I really do need it now' situations. In some cases, Guitar Center might have it, but the closest one is more than an hour away, and they wouldn't have had the components to make the specific cable that I needed, and they sure wouldn't have had N-connectors and magnetic antenna mounts.
I hope they can turn it around ... I'd be willing to pay a membership fee just to have them around for when I really need a part.