I spent a lot of money on Google in the RV industry (to the tune of $500,000/month for a certain fortune 500 company) & there are a lot of issues with this post:<p>First up, his stats across the board aren't even close. His impressions vary by a factor of 4 for the different ads. From that alone, I bet he forgot to turn of the "optimize my ads" setting from Google and switch on "rotate evenly".<p>The "optimize my ads" feature sounds like a good thing to leave checked, but like most things is designed to make Google more money. That setting basically allows Google to start optimizing whichever ad gets out in front first - which doesn't let you figure out which one is actually superior. So the data is tainted from the start.<p>Also,<p>> The .co domains have a performance penalty versus their .com brethren but the differences should be proportional.<p>Where do you get this from? In PPC I haven't seen any studies on this at all. I could understand .com leakage on .co domains for people typing it in directly out of habit, but Google doesn't penalize ads based on their TLD.<p>Not to take away from the strategy (it's a great idea & this is exactly how Tim Ferriss picked the name for his Four Hour Work Week back in 2007[1]), but there's a lot of flaws with this specific example.<p>[1] <a href="http://boingboing.net/2010/10/25/howto-use-google-adw.html" rel="nofollow">http://boingboing.net/2010/10/25/howto-use-google-adw.html</a>