One person pointed out that they don't look at the cached version when they click on the search results so it wasn't effecting them at all...sigh.
And I'm sure that's pretty much how the rest of the world thinks. Who cares what was done with some keywords here or there, as long as the content is relevant. However, there are many out there who think differently and want others to think as they do as well.
Make pages for users, not for search engines. Don't deceive your users, or present different content to search engines than you display to users.