If I were running that site I would be interested in sending that email to a randomly-selected half the userbase and then seeing if and how they behaved differently on the site. After all, the letter says both that you, personally, are more attractive, but also acts as kind of guarantee that the people you are being matched with are more attractive too.
There may be some ethical considerations here of course.
Not that they don't have standards--I'm sure they're very careful not to release anything that would reveal private information about specific, identifiable users.
Other than that, yeah. Those guys pretty much do statistics for the lulz. I would not be surprised at all if wzdd turns out to have been correct...
There may be some ethical considerations here of course.