I noticed that Attackers started putting out tentacle porn more regularly. Myself, I have only seen two (and will watch my third later). One with Yuka Osawa and the other with NOZOMI ICHINOHE (who must come back and do more JAVs). So, for me, tentacle JAVs are good if one of my favourite performers is in it (and I do like Hitomi Tanaka).
There's a compilation thread regarding that subject. Though, I think it's dead. andalaugh: Source: http://www.akiba-online.com/forum/showthread.php?t=97579
It would be nice if they would put more effort in it. I don't mean the performers, but the ones who are responsible for the stage props. In hentai animes it is no problem because everything is drawn / painted. But this tentacles JAVs are really poor. Maybe their budget is so small so they can't do better props. I like the genre, but I don't like the JAVs which came out until now.
for some reason some had the idea that people want live version of this. looks like to me people want live version over the anime one. for so long only way you could see this in anime. so some thought there be market for this. be the looks of this it worked.
