That’s a tricky one. I would assume most people would want to keep costs down, and games are usually a lot more expensive than books. It also would exclude a lot of people that don’t have whatever console etc the game was on.
As for eroge, I would say probably that the advanced category would be the only one that the genre might be considered, as there would be a bit less onus on us (Bunpro) as a platform to choose suitable topics. I really don’t mind what people want to read at the more difficult end of the spectrum when they are completely self sufficient, but in the lower levels when people are still getting used to the language I think it would possibly be something that presents too many challenges. I don’t wanna tell people what to and what not too read though, and am also of the opinion that all vocabulary is good vocabulary, so it would be something left to the voters.