I have been using both ebay (EPN) and adsense on my sites for a long time now and well I can honestly say that adsense just is not making the money it used to.
I used to do $200 a month not massive but still month in month out. Now its only $150. However Ebays affiliate program is well all I can say is that its on steroids. All my sites have Ebay affiliate products in and its makes so much more.
If some one clicks on adsense you will earn $0.50 but if someone clicks on ebay you will earn either £0 or you may earn £100. its truelly amazing.
I have been banging out ebay sites and forums for a while and well my plastering forum is very profitable now which is good. its gets around 150 post a day and 6k of page veiws a day. Ebay works well with it.
I think I will be changing all my sites away from adsense where possible and concentrate on promoting ebay products.... see how it goes