Google AdWords Specialists

As I look towards 2008 I realize my business model needs adjusting, not much mind you. But in which direction is the question.
PPC management/service/consulting business models vary, but seems to me they fall into variations of these three models.
Flat Fee
Per Hour
Performance
Here are basic pros/cons of these models from my perspective.
Flat Fee:
Pros - easy to understand, [...]

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