Rather saving the money to buy me off a drink I guess.
Sorry but what if you don't have any idea what php code looks like ? Or what if you don't want to look into any coding ?
And what if you get a Joomla! update that changes the head.php back to what it was (and you forget to change it again?)
Even if you put this code in your template you still have to put it there every time you change to looks of your site with another template.
Face it, in those cases this plugin saves you a lot of time.