I remove entries when a Client is Not Interested - either when he marks it as such or he just doesn't even seem to notice/care about one of my designs after it has been on for a while.
That is why it is important for Clients to understand that they must try and rank or give feedback to as many designs as possible. There have been competitions where a CH did not give any notice or feedback at all to many designs, even after a designer's request. You have to understand that we put a lot of effort and time into this and since there are many other contests happening at the same time it is only logical for us to withdraw a logo which does not attract interest, rank or feedback and perhaps use it somewhere else