At first I got into them because I wanted some porn...I downloaded Wanko to Kurasou waaaay back in the days of puretna, haha, when I was barely even into hentai. I like a lot of different kinds of porn though, so the mood struck me for something different...really different, and I downloaded this loli dog girl game on a whim. Then when I got around to playing it the story had me hooked until 5AM and then I went looking for them for the story and played a bunch. I liked it a lot better than anime because it doesn't blue ball you by limiting it to only ecchi stuff or have as much dumb indecisive harem shit, but let you actually go all the way with the girls you like.
Now there's story-based VNs coming out left and right and I've come full circle and just want them for porn now, haha.