If I were #1 on Yahoo I'd keep it to myself. Up until a year or so ago Yahoo results were mediocre now they are pure unadulterated garbage. The sooner they start to use Bing to drive their results the better.
In my niche for the top $ term the #1 is a recently launched hyphenated generic domain with a site built purely for affiliate links. Below that are 4 sites with high repeats, high density and characterised by the undoubted fact that they all paid some poor guy in a low wage part of the world to buy them links from off topic low quality blogs.
It's just complete garbage. Yahoo's only saving grace in the UK is the fact that it only has 4% of the market. I wonder if those are the poor thickos who get the oh so simple question in "Who wants to be a Millionaire" wrong when the even thicker contestant asks the audience.