hex wargames are: 1) not so small of a niche 2) a great marketing decision - just like space sim, this genre has amazing potential revenue per customer. That's proven empirically, as for a reason - I would hypothesize that main market for that sort of thing are nostalgic middle-aged tech specialists, which is a market with amazing "size * disposable_income" potential. That doesn't only make the whole pie larger, but also drives AAC (allowable acquisition cost) up, which makes marketing so much easier.