We are... TOTAL cults. Cult film, cult TV. You've never met cults like us.
The aliens board game was apparently very good but I've never manager to find a copy at a reasonable price. It was converted to a computer game however that available for free (and quite good).
Boardgames don't seem to depreciate at all, plus they cost a fair bit to post. Most boardgames (vintage or otherwise) will set you back £15 - £40 plus that again on P&P. It's shame really.