Seconded. However, in Google AdWords, you have the luxury of sending your soon-to-be-customer to a landing page. You can change anything about that landing page without impacting the experience of your site for "normal" users.
With TechCrunch, they're likely going to be sending folks straight to the front page. Which means optimizing for the 100,000 ADHD squirrels hopped up on crystal meth means pessimizing for all those forgotten sobs paying you money.