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If Google stays true to their normal business tactics (Adwords), as soon the new platform gains traction the CPC will start to rise and any profitability will go away.  Never forget, Google is a publicly traded ADVERTISING company whose sole purpose is to drive investor value.  They do this by convincing businesses to commit their advertising, then they ratchet up the costs to maximize their revenues. Any success you see will be short lived, they you will have to move on to the next big thing.