I've watched some of the torture vids, and what I have observed is that the victim really is not a 'victim'. They want the pain. That seems phony to me and bores me to death. Like in the song Adult Books by X
Clifford shackles Jane
Throws her on the floor
She says, no, no, yes
And he cuts the chains
But he just goes for that special girl who says, nooooooooooo
Now, I don't advocate unsolicited torture, so don't get me wrong. But what I will say is that the victims are not good actors. There is something called 'Suspension of disbelief' originally coined by Samuel Taylor Coleridge, that makes any movie good or bad. If the viewer can't convince themselves subconsciously that what they are watching is real, then it has no emotional effect.
I do like torture stories. I read one once, and this is true, about how Russian female officers would interrogate Nazi prisoners during WW2. What I got off on was how cold these women made themselves. Once they where done, they would simply execute the guy, then go have lunch or whatever. I mean, what an ultimate fem power trip