Well, I would imagine it depends on the person in question. Some people would find it empowering, but others might have a different reaction (particularly if they were the submissive one). But, certainly it's not an uncommon feeling, and I actually know people who are past victims of abuse and who practice BDSM so, as you say, there is actual factual evidence of it being the case for at least some people.
I think saying "all victims would see it this way" as a blanket thing is probably not valid, but certainly many of them do, particularly if they trust their partner (as Sakura would with Shirou) and know that he would never do anything she is not comfortable with. It can certainly be healing to go through similar situations to your abuse, but in a more controlled environment with someone you trust and where you hold the real power (because they're only doing it with your full consent). As you say, it gives the ability to look past it and get over what happened, by giving you power over events you previously had no power over.