No, it doesn't matter if she's a prostitute.
But the truth is that most of the men here can not afford to get involved in the personal issues of the women they meet in the hobby, whether it be chemical dependency, abuse, whatever. We risk exposure we can ill afford.
I've known more than a few women whom I've suspected are in some sort of trouble (subsequent events have borne out my suspicions in many cases). Not once have they admitted it to me, not that I pressed the matter, so I've never intervened. I suppose if I was asked to help, I would try to find a way to do it...as long as I wasn't putting my life (or way of life) at risk.
So, yes, we can huff and puff and talk about what bastards these abusers are...but the hard truth is our own sins prevent us from doing much about it.