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Instead, having very good writing skills is far more important for both visual novels and dating sims (although a bit more important for the visual novels).
Those games are also famous for having many endings.
When people ask me for advice, I always tell them there is not a single, universal, valid answer.
There are several ways to sell your VN or dating sim (or games in general) and I know people who are successfully making a living using very different methods. ~ Freeware The basic idea here is first to gain popularity and a following through a few decent free VNs or dating sims and then try to sell new games to your fans.
To be clear, they originated in Japan and, while many visual novels or dating sims are erotic (or at least sexy) in nature, it's not true that all dating sims have erotic content.
It's really a shame that people automatically label these games as "adult only" because, in many cases, is not true.