This was the ultimate "lazy system" for a while. But, like everything easy, people started abusing it and Google became smarter. After their "smart pricing" and "quality score" algorithms came into effect, many webmasters stopped making money with Adsense Arbitrage. Heck, most people stopped using Adwords or Adsense altogether!
Proper keyword research: There's tons of cheap traffic yours for the taking. And it only takes a few hours to find all the keywords you could ever want!
Achieving a high Adwords quality score: This is a combination of your keywords, ads and landing page.
