Re: More bad research?
>The.berlin works to promote ratings the same way that "www.berlin.example.com" would.
Exactly... Google uses the domain as part of it's scoring. A website with a direct domain keyword match will rank higher than one without. Of course if you fill the page content with obvious keyword spam, it'll de-rank like crazy still, but most genuine businesses don't do that.
Google's rankings are a little mysterious, but not that mysterious.