If it's the latter then that's a good example of what I was suggesting, but I think it's more likely the former. Effectively, had these people been given the choice of say, NWN or this they'd almost certainly have gone with NWN. His sales are likely based on people who are not much in to gaming accidently stumbling across his site, not realising there is anything better out there or previous customers who found his products in this manner etc.
I think you're entirely wrong in this characterization of Spidweb's audience. They've been around a long time and has cultivated a devoted following that actually wants tile- and turn-based RPGs. I'd be very surprised if they didn't make up the majority of Geneforge 4's paying customers. I doubt he gets very many first-time buyers on any particular title. Perhaps he'll provide these numbers in the followup he mentioned in the blog.
That audience includes me, by the way. I lost interest in Baldur's Gate 2 very early, and have never played Neverwinter Nights, but I have bought half a dozen Spiderweb games going back many years.
