lets say you have a website with 1,000 plus posts, and for the sake of this conversation lets say they are mostly on travel and expat life
you rank well for expat life, maybe not quite as well as you would like, but your site is still earning enough money that you are satisfied and don't want to do anything to risk that
on the other hand any post on travel or anything else does not rank on google at all, when you look in webmaster tools the few that do get any google traffic only come from when people search for expat type queries and the travel post ends up in the results instead of the intended expat life post
you do rank on yahoo for both, but as we all know yahoo isn't a big deal, and there is the potential that if you delete all of your travel/other posts your expat life posts could potentially jump to the top of the rankings
having a significant boost in google rankings for these would far outweigh the small loss of traffic from what the travel posts are bringing in
but visitors to the site surely like having longer reads on the travel inbound links, so you get longer visit times and it may help you convert.... for the sake of this discussion lets say the main affiliates are all travel related and not exactly expat related, though you can still market the travel affiliates on the expat pages
so.... even though you are fully content now and things are actually going better than you could have expected do you make the ballsy move of deleting all the travel stuff? or do you not rock the boat and be happy with what you have?