There was a time when I used to fairly obsessively watch ad revenue from my sites. That's when there were two providers. Now, there are six. A tangled web of defaults between each other and my own app trying to distribute them in a way that makes sense and returns the most revenue.
Well I login to one of them and find that it hasn't served shit in three days. Look around, turns out the others haven't either. Turns out that Federated Media, the one who I hoped would sell the crap out of the site at high CPM's, let the default ads expire and it has no way to warn me.
I can't just be annoyed by the situation, of course. Instead I'd rather read into it as some statement about me or something. I'm looking for that magic technological solution to just make shit work.