Ad Pruning affected Google Ranking
Ad Pruning function in Classipress is mean to remove the older ads which expire. But in terms of Google, its not a good idea when there is alot older indexed posts will be seen as invalid link.
My site just gone through this problem where new posts is no more ranked higher in Google. Practically to have all the ads in your site also not good as the older ads may be no more relevant or the products no more available.
Any idea on how to overcome this problem is very much appreciated!