This is kind of a silly suggestion that I've been hearing from a lot of people lately, and there isn't any truth to it what so ever. Google doesn't punish people who have a lot of links. How many people link to Microsoft.com with the word "Microsoft" What if your site was listed in 10,000 directories and the link text was your Company Name or your URL? Google may "watch" this sort of thing and manually de-list sites if they feel the links are a result of a SEO and not independent sites who all happened to use the same anchor text in the link, but I am sure there is no automatic process that drops people if they have too many links with the same text. Google's philosophy has always been that you have no control over who links to you, so they wouldn't penalize people for it unless they had a good reason to suspect that "you" were linking to you.