You're talking as if the 'wider' audience would be just underaged people... Seriously, lots of people don't play porn games, not just underaged.
Let me clarify something here: I saw some posts saying people were fine with VNs being niche, but I'm not. Being niche doesn't just limit the audience, but a lot of other things in consequence. Fan works, for example, at least in West, usually just come with an anime adaptation. And even the variety of genres is affected by that, wider audiences require a more diversified number of genres to choose from, just like anime. More investments too with more ambitious stories, etc. This is why appealing to a wider audience can be very good.