It may not have been thier intent at one time but I things have changed. Others would say otherwise.
Someone posted that thier was a area in Australia that had a major downturn in real estate values during Rutherfords time and he instructed the brothers thier with the Borgs money to buy buy buy.
Plus we know what happen with Beth Sarim. I think Beth Sarim was the idea originally for a place for Rutherford to stay but then they realized what they had accomplished.
This maybe can be confirmed in January 14 1975 when instead of spending thier money to tell the whole world that they only had a few months to live they bought the Towers Hotel in Brooklyn New York.
For me this is the smoking gun of thier true motivation. Plus a lot of thier newer transactions haven't been about Kingdom Halls but nice properties they call translation offices and the like.