Rus -
like bpk I'm also a bit ignorant to internet advertising so I'd like to pick your brain for a bit.

Specifically you had mentioned that the more targeted your audience, the more you can charge for ad space.

I'm curious if one were to provide specific information about one's audience, such as geographic location, average age, sex, economic status, and spending habits, how much more you can charge for providing very specific demographic information about one's audience? Are you talking about a 10-15% increase in adspace price or something more around the lines of 50-75?

Thanks