We are launching a community website for tax professionals. What we have is a semi-finished website, some unique and relevant content and a decent plan for promoting the website. What I am not so sure about is how we will make money from ads (and how much to expect). We need to know because we'll have to pitch our business plan soon. For a niche site with maybe 2000 unique daily visitors (mostly European tax professionals), how should we go about selling ads? I've heard YPN would be better for us than Google, is this true? What are the pros and cons of selling ads in-house? Which online ad network is right for us? Does anyone have experience with a service such as Adify? All input is greatly appreciated...