How Much is Surf Industry Banner Advertising Really Worth?

Hey Guys,

 

I know most people on here get hit from time to time about advertising in some capacity on a surf industry site but what value do you really place on banenr advertising? I wanted to find out by listing a months homepage advertising for 99C on ebay as an experiment

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=180462221341

PRE GFC, banner advertising within the surf and travel industry went for a standard of $30 CPM for 100,000 impressions - equating to a campaign spend of $3000.

But how much is a true one off banner ad campaign free from the tangles of contra deals and backhanders really worth?  :?: