PPC and Affiliate – PROS and CONS please!

I currently run a ppc camapign for one of my client who is going to start an affiliate programme.
My client has asked me what my thoughts are re the benefits/disadvantages of letting Affiliates running their own PPC campaign:
– Inflation of CPC/Cost per Sale
– No control of brand bidding
– Increase of Share of Voice
– Incremental sales
Any ideas????

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