What are +4 million pageviews worth these days?

[Simon]

As mentioned earlier...

I didn't want to tag any direct revenue to these two sites because there just two sites in a large group of "free content archive" sites that are used primarily to attract surfers, convert them into bookmarkers, and eventually interest some small few of them to click links to our own other sites, including paysites. We don't track these (older) sites individually to attribute how much revenue they're eventually responsible for. All we know is that these sites send a good deal of traffic to our other sites.

What we know is how many visitors come to the sites. And we know how many pages they request. We know how long they stay. We know what keywords/phrases brought them there, and/or what site they came from. You know, all the things that basic traffic stats will show you. We just don't know the dollars each one is responsible for.

Yes, our new projects use advanced tracking of all kinds. But we haven't gone back to many hundreds of older projects and updated what might be millions of varied links to use today's tracking codes.

So basically I'm wondering how you value a couple of sites out of a whole bunch that are all lumped together for most other tracking purposes.