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I'd say they do it mostly because they don't just run their ads on google and they use their own system to track their results all in one place. Most of the time those redirects also drop a cookie to track conversions.
They have traffic from google, overture, affiliates, natural search, banner networks, link exchanges etc etc and they track each promotion in their own internal tracking system. Also, many times they are promoting much more than one product as well and they like to track all their promotions for all of their sites through a single interface.
Lots of times those redirects are also affiliates promoting products and using their own systems to track results. To the best of my knowledge google doesn't mind tracking redirects. I see atdmt and affiliate network redirects all the time.
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