I agree with peachdz9 - I want the designers to focus on what the I want... not what I rank. If I keep all of the logos in ranked form - say 50 of them - some may misunderstand that their image was still a "possible" candidate ... maybe not too far off... so they may start tweaking it... more often than not, this is not what the customer wanted....
If I put the images into the non-interested area - this pretty much tells the designers the obvious rather than beating around the bush...