10
I was under the impression that servers could (if not should) be set up to disallow direct access to these types of directories - i.e. an unidentified user does not have full access, but the system does and when the system calls for a file it has access, however if a user simply types a URL directly to, say the css file, it will be denied.
Leeching is pretty lame, and in my estimation show a lack of creativity and effort to make something unique. Some stuff is great to learn from, but you'll never learn from simply copying. If you want to learn css, there are some GREAT sites that have both overall as well as step by steb guides for all levels of understanding.
Well that was my two cents worth