One thing people forget about tubes, is that they re-inforce Google's own business model, and the surfer's positive attitude towards that model.
It's a type of behavioral conditioning. Google doesn't own the porn tubes, but it can act as though it does, and benefit from them in an indirect way. Tubes offer the surfer a consistent Google-like experience, even when he's browsing porn and not actually using Google.
Affiliates on the other hand are working to a different strategy, which contrasts with Google's own strategy, and also contrasts with the wider "mission" of Web 2.0 .
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