Broken link to Checkout Page

When logged out there is an option to Sign Up but the link tries to bring you to the checkout page. I can see where this is coming from in the code

<div id="submit-site"><a href="<?php echo get_bloginfo('url') . '/checkout/'; ?>" class="button">Sign Up</a></div>

but I don't understand why it is there when there is no checkout page setup. Should I change it to "sign-up" as with the link in the top menu? This is obviously easy to do but just want see is there actually some logic to having it as "checkout".

Thanks.

*edited stripped out code...