It's somewhat sad that niche wargames are often hard or inconvenient to get and are noticeably more expensive than games of other genres. It was maybe acceptable in 2000s, but nowadays I feel like it simply alienates 99.9% of the possible buyers. As someone born after SF1 released, I can say with a degree of certainty that none of my peers (and I'm getting a degree in IT, so most of my social circle are tech-friendly people) would ever touch a game distributed like that (except that one guy who will, but only if it is open-source and runs on Linux). Frankly, I'm not even sure how I managed to get here...
On top of that, I personally believe that this is one of the key factors why games like that rarely get sequels. There are a lot of equally niche games that are much more popular. Victoria, Europa Universalis, and, to a lesser extent, Hearts of Iron (not trying to advertise anything here) were equally niche when they started, but the insanely large number of steam users made them commercially successful for years. In fact I'd say that they managed to create their own niche rather than being a niche of a niche when they started. That's just my 2 cents though.