buckworks - 1:46 pm on Feb 7, 2013 (gmt 0)
display network campaigns ... always been unprofitable
Something I've found that helps on the display network is to block sites that have anything to do with games.
There are a gazillion sites out there with cheesy cartoon games that trigger our ads because they happen to mention the right words but they're not the right audience at all IMHO.
Worst of all, they don't get reliably blocked when we add "Games" to our list of undesired topic areas. I have to hunt them down one by one. It's an ongoing battle.