Yes, it should read ‘show duplicates’ rather than ‘remove duplicates’. It would seem that it is only really useful for removing identical copies of tracks, of which I had only a handful.

As you say in your blog post, duplicated tracks on multiple albums actually belong there, but it would be useful to reduce space used if these could be consolidated.

I’m not aware of a remove duplicate feature but there is a way to “Show Exact Duplicates”. iTunes also has an option to “Show Exact Duplicates” meaning you don’t have to download anything or pay for anything to properly delete you duplicates. Check out how here: http://www.dagaza.com/2010/03/delete-duplicates-in-itunes/