Besides the reasons that were mentioned above me, there is something else that hasn't been brought up, and that is that unlike the typical conversation in this forum, the Asian patrons down there in Ciel do not mince their words nor do they hold their tongues when speaking ill of Fujino or his works.
Whenever he makes a report post or a game release you can always see tons of negative comments, and while we do critique the game quite a lot here, things are bit more inflammatory over there.
You have to take into consideration that Fujino's games are not exactly the same as other NTR game makers, so his community is similarly different from the ones of other authors. There are a lot of people who find out about his games, not because they are fans of the genre, but because they are fans of FSN and SAO.
And Fujino also doesn't have that thick of a skin, or at least it doesn't look like it, judging for how he reacts to criticism in the comment section of his posts.