Why not add a banner in the Forum page under search field?
I think could be an ambitious banner to sell every month with an auction.
Do some one have already propose it?
I would vote a "No" for this one. The forum already has a lot lot of ads, also if there is a banner on the top then it would be priced high and so you'd also need to change the format of the auction(the admins are really too lazy to do so
). The forum is also earning enough from the present ads, so I don't think we need more.