mmm, interesting topic, I also see the opposite happening : russian (ex) porn girls, that move on to webcamming.
For example this girl:
http://mypickupgirls.com/girl/Melanie.html?119 ( as mslily on myfreecams ).
There are more girls like her on myfreecams, that I have seen before in porn videos, that are now webcamming.
Not all porn actresses are automatically succesful on camsites, it takes a different talent, you need to be able
to keep the conversation going in the chatroom, and seduce the guys to pay $$$ for a show.
For example, Sophie Moone and Cindy Hope have tried to work on webcam, but both failed miserably.
There is a lot of russian talent on camsites, that I would really love to see in a good porn video.
Some of these camgirls already make their own video's, which they sell.
So, there is no porn producer involvement, they just shoot the video themselves.
Maybe the reason these camgirls do not move over to the real porn world, is that they make more money on camsites,
then they would doing a porn video.