The world is an amazing place because some people do things which are really useful... but also because some people do things which are wacky, unexpected, ridiculous, wasteful, pointless or stupid. When anyone shares anything at all—whether useful or useless—if it's interesting to someone, it's a potential source of joy.

From the perspective of the individual, how is this any different from time spent playing a video game? If making an RCS for System 6 is entertainment for you, do it. Do it with the same relish that someone else might get from playing a video game like Lode Runner or Dark Castle.

If you want utility, how about stories? Stories have utility. In this case, his tale of creating it is a worthy story. And like any story, his could spark someone else's imagination. Perhaps it could lead to more retro-programming which fascinates and delight us.