You know there's nothing stopping you from buying a server rack and loading that bad boy out with as much processing power as your heart desires, right?
Well, except money I guess, but according to this 1969 price list referenced on Wikipedia, a base model PDP-11 with cabinet would run you around $11,500. Adjusted for inflation, that's about 95 grand. You could put together one hell of a home server for that kind of money.