I'm building an online application to interact with volunteers at events. This site will involve hundreds to thousands of people for each event creating an account, and visiting the site regularly. To keep the cost down for events, I'd like to subsidize things through advertising.
On the up side, I'll be able to very accurately profile each user. They will be geographically clustered, and have many similar interests.
On the down side, the site will be behind a login screen, and served almost entirely with dynamic content based on each user.
From what I've read, I like the concept of Adsense - but the technical limitations may be too much for it to overcome. I don't have the time to build a whole advertising subsystem to allow the events to solicit their own ads.