I think people do still buy V4/M4 characters, but they don't pay a lot. I pay a little more for M4 characters, because they're rarer than V4. But still not much. 

I don't think there's anyone still making stuff for V4 or M4, except as a fit for an item made for another character. You see this a lot with hair or dynamic clothing. It's made for Dawn, LF, PE, but there's a fit for V4 included. 

I thought you were going to make stuff for Dawn 2?