Chrispcritters - 4:52 pm on Aug 17, 2012 (gmt 0)
You just have to think of the different services of Google as if they are entirely different companies. If your run-of-the-mill ad network suggested three ad units, left aligned units, etc. would you do it? They are going to tell you what is in the best interest of their business unit. Same with AdWords, Search, etc.