Some advice (I used to work on large £100,000/month AdWords campaigns): * Start small, just like the author did. Try to spend as little as possible, either the 1p/click minimum or target the bottom of the page (position 9.9 so you're just "above the fold"). Cap your spend. * Measure, measure, measure. It's not even worth starting a campaign unless your whole site is being measured in every way possible. Personally I'…
All good points of course. But the idea is that when you're trying to do customer development, AdWords is a tool but not the best tool for learning. You can't ask a question, for example.