Earlier quoted context omitted.
Because what you're talking about is a much, much smaller business.
Adafruit, Sparkfun, et al, might like a word with you. Even though they are smaller businesses, they are thriving, there is nothing to say that they would be if RS had taken the same road.
Radio Shack is a retail store with many locations. There are not many people that have an immediate need for Rasberry pi components, they order online. So that model is dead. Radio Shack despite this does indeed still devote a small area of the store to things like this.