You shouldn't have shorted in the 9's.. Did you see the new institutional ownership today? Goldman Sachs, Morgan Stanley....if I were you I'd stop doing the napkin math and start covering my shorts.
Given what Justin said on CGS board, if CPM is basically number of times ads are shown, this can considerably change depending upon number of tv's in a bus. In their photos from presentation I saw 4-6 tv's per bus. If we go with 3 and a CPM rate of 10 RMB which is probably fair that should do it right?
So all we need for the math to work out is for the premium airport-bus segment to charge the same CPM as their competitor VISN does for its regular segment... 26rmb CPM in Beijing, links below:
Your viewer calculation is flawed. 1. It takes about one hour for passenger to reach destination. So every hour passengers SWITCH to a new group. You need at least factor of 16 for daily passenger volume. 2. Bus load is typically 85-90%. remember sometimes it is over 100%. 3. They charge premium for holidays or special event. Guanzhou is to be the host of Asia game. Likely they will get premium on AD rate. in a word CPM is just a starting point.