Why Build Web 2.0 sites?

I see a lot of people that like to build tons of Web 2.0 properties,
and I am just curious on why, when their are so many high pr
link sellers to get quality links? No, not $5 fiv, and they are not
cheap either, and price range can go from $20-$100...

If you get 10-100 web 2.0 properites back to your money site,
and then I get a backlink from Wiki to CNN, who do you think
would be more powerful. I am not being a smart ass, as I am
not an SEO guru, so I am seriously asking that very...

Why Build Web 2.0 sites?

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