For the past three years I have had one site ranking #1 for it's main terms. As many people know, I'm getting out the industry and have been selling off my portfolio of domains and websites.
I've exhausted my contact list so have turned to auctions. I posted this particular site up for auction and listed the fact it was #1 on Google for it's main term as an incentive to buy.
48 hours after listing it, it lost it's #1 spot. After 3 years and surviving every Panda and Penguin.
I know we laugh at co-incidences here and see plenty of paranoia. But could listing your site for sale affect rankings?