There's ways that websites can make ads so they are unobtrusive and actually convienient.
Fat Wallet has a great program set up where if you include the words "Staples", "Best Buy", "Office Depot" "Comp USA" , etc
in your posts, they are automatically converted into referal links to those companies websites.
I'd say AT's Hot Deals forum is at least as big as FW's ... they could making a good chunk of change off that.
And other websites ..
DVDtalk for example have two rows of banner ads at the top, yet its not obtrusive.
They even have about a dozen links at the very top of their forums pages to various stores that their members use.
AT needs to market its ad space better and use it more efficiently.
Having ONE ad take up a column thats about 10% of your screen, and causing blank space to run down the whole page is not the way to do it