It does depend, on (among others): - your visitors' age, gender, location. A highly targeted audience is usually worth a lot more. - visitors' intent (are th

It does depend, on (among others): - your visitors' age, gender, location. A highly targeted audience is usually worth a lot more. - visitors' intent (are they researching a purchase related to your site and the advertisers' product, or are they looking at pictures of LOLcats?) - the product being advertised (mortgages or facebook apps?) - how much the advertiser's willing to pay (some companies will pay a lot more than it's actually worth, but they probably won't pay you more than they pay Google)