It's unused because it's not actually part of the logo. For those of you with large screens we've been kind enough to include a repeating bg image behind the banner which continues it on but is not actually a part of the banner itself. This is just so the banner doesn't suddenly cut off. However, we can't actually make the banner image any larger.
PS: Thanks for all the kind words. Nice to know that people are approving of it -- especially Equinox. I am pleasantly surprised that you like it.