Many of the Flippa niche content sites (rather than 'service' based sites) are evaluated not just on traffic numbers, but on the product of traffic and topic-based AdWord CPC values, e.g. the top ones being: http://www.wordstream.com/blog/ws/2011/07/18/most-expensive-...

I tested the demand for this and my experience is that there aren't enough buyers willing to pay for the kind of expertise required to curate listings based on some basic due diligence checks, filtering out obvious fakery, and using standard business valuation models to suggest a price range for sites being auctioned in Flippa. You've got to bear in mind that it's very time intensive work to get to the real figures. For example, most sellers don't deduct a nominal cost for their own time. To "normalize" their accounts you'll have to first decide how much of time/expertise is required to run their business and what that would cost.

You may be on to something there. Sometimes I see sites for sale on Flippa, but from the comments I can tell that some potential buyers have discovered something negative in their research that I would have overlooked. I'd pay for an extended, honest, third-party analysis of some current flippa offerings. Help me value sites I'd consider buying, and I'd see value in that.

That's an idea :-) I for one would really like this. I think in general there's not enough information on monetization.