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I agree with most of what BVF said, especially about the inhouse/ outsourcing part. However I don't think TGPs are going to be ubiquitous at all - there are still better ways IMO to get bulk traffic at a better ROI, and people who can do it - eg through SEs, or I even know free site webmasters who have mid- to high- level TGP traffic levels over their entire network of (very advertising heavy) sites. There's always mail traffic too.
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