You could put some javascript in the Custom HTML section of Confluence Admin to unlink it on page load.
<script type="text/javascript"> AJS.toInit(function(){ if(AJS.Meta.get('is-confluence-admin') != "true") { AJS.$('#logo a').attr('href', '#'); } }); </script>
You'll have to hack the theme or core code to do that. (Not sure why you'd want to either, all it does is take the user to the standard home page, which can be useful)
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