I'm an old member but I must admit I've been mostly a lurker. Sorry for that.
Now, if you do not mind, I'm coming to somehow fullfill my curiosity.
Would you mind sharing your % of "Unmatched ad requests"? I'm curious about how many ads Google is not able to fill at this stage, when they're already working with quite a lot of external networks.
Mine is right now approx. 25%. And it seems way too much.
Thanks in advance.