..... I also suspect there's a reasonable contingent of people who hold onto their subscriptions without actively playing.
Another factor in that purchase decision is in how sticky the subscriber base is.  I suspect HT's subscriber base is pretty sticky.
I'm one of those in a sense.  This is the only puter game that interests me.  I maintain my subscription, despite periodic months of of little or no activity in the game.....depends on what else is going on in RL at the time.    I do so because I want this game to be here when I do want to play, and realize it's a small outfit with a limited player base, it so I feel it worthwhile to support Hitech whether I'm active or not.
Another thought on the value of social networking.  My oldest son started a successful online business, logicalincrements.com, with a guy from Malaysia that he met online.  I recall early on that they got a huge boost in traffic from someone posting about the site on Reddit.  I know little about Reddit, but apparently the post caught a lot of attention.     The day of the Reddit post, the site received so much traffic that it shut down the Amazon server that was hosting the site.