I'd say maybe 1000 of all active JWs worldwide are active publishers but mentally out. I put my 2 hours in a month, nobody really talks to me at the meetings, i never comment, i get to the meetings 5 minutes late or just as the opening song is to be played, and leave within 5 minutes after the meeting. Some elders bother me about my activity but I just tell them I'll work on it and school's keeping me busy. I enjoy my "violent" video games and the occasional R-rated movie. I hope to be completely faded/disassociated within 2 years.
Even guys I knew who came to one or two meetings a month still seemed super in it, which i always found strange. I don't think I'll ever meet somebody else mentally out but still an active JW, it's too risky to admit it to others and then get ratted out.