Only once have I found a providers real name, and that was more by accident, and I never did tell him that I found it. I am more interested in the service they provide and also allowing them to preserve their privacy.
I did once, however, let a provider know that I saw him in a porn video. He was not a porn star, and so, I wasn't looking for him in a video, but found him nonetheless. He seemed a bit embarrassed, but he was better when I told him that I that it was really hot!