Oh, don't get me wrong, there is this old saying in advertising after all: sex sells.
This is done in stories too. You see it most often in movies. When they slap a romance sub plot on top of the real plot. This can of course go wrong. But if done right, it increases tension and drama. And it is the major plot of most stories.
And if your story is successful, there is always rule34. If you did not start with an eroge, someone will make one of your content - if it is super popular, like ddlc.
Since you cite ddlc, I am now assuming you are not planning to create a linear story game. So you might want to think about those things:
Will your story and game mechanics be anhanced by the eroge angle?
Will the eroge be enhanced by the story and game mechanics?
Can you pull off the eroge angle visually?
If you can answer all three with yes, maybe try going for an eroge. But maybe "regular" romance would be enough. Unless you are very lucky or exceptionally good, chances are you will not have a wide audience either way. The cheap views I talked about mean, that some people will look at your game, just because it is an adult game. But this does not mean that they will like it. There are also people that look at visual novels with certain topics, just because of those topics.