DaCostaBR: As for the OP: You're misrepresenting those games. Persona 4 Arena is a fighting game, so is BlazBlue, and the Ace Attorney games are point-and-click adventure games. Just because a game may have overlong cutscenes that does not make it a visual novel.
That being said, I have nothing against them being sold here on GOG and, like it's been pointed out, To The Moon is already here and that's a visual novel.
Those games I mentioned all have either have VN game modes or were evolved/made by those who started making games in the genre. With specific reference to Blazblue and Persona 4: Arena - they have VN-type game modes. When you play the story mode in both of those games, you are presented with reems of text accompanied by voice and are given options every now and then - these story modes are classic examples of what VNs are. Yes they are fighting games, but they also include an example of what most VNs are structured like.
As you've probably seen in other VNs, some of them do contain gameplay or some type of mini-game. Maybe it was not made clear in my OP, but these games are
indicative of the visual novel type of gameplay in their story modes. I
did not mean to say that they were visual novels.