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In skins/MonoBook.php is an little typo:

<style type="text/css" media="screen,projection">/*<![CDATA[*/ @import "<?php
$this->text('stylepath') ?>/<?php $this->text('stylename') ?>/main.css?7";
/*]]>*/</style>

i think the ?7 is wrong there ;-)

It's by design. Each time the skin is altered structurally, the digit is
increased, ensuring that the css file is reloaded and not served from the
browser cache.

Oh, okay nice idea to solve this problem.