Nabble - the guys that provide the forum will remove all ads when you buy credits from them.
Everytime a page is loaded and an add stopped that is 1 credit.
10,000 credits is $6.
100,000 credits is $30
1,000,000 credits is $150
to date the forum has had 1,000 or so views.
I don't think the cost to ART of removing them is going to be significant per year.
You can also choose if ads are stopped just to registered forum users or to everyone.
Ian Wilde