Actually, I have 3-4 full-time and 3-4 off-hour computers on CNO CPU-mining for now to keep it busy. I might start to put back ASICs in a couple of weeks to keep the network busy and safe. 
Are they all online? I just noticed I'm only connected to a single peer, 70.38.54.10
Overall, at least 3 PC's are on all the time. You are right, I never saw more than 3 peers on the list. Definitely, they are working; one I just checked did get a sizable reward. I am not sure what's happening. Maybe CPU miners are not counted.
Expect to see more transactions with more promotions coming.