The game client was created on April 2013, so as of July 10 2013 it has been working for less than 3 months, a growth of over 5,000 new users of the application per month is a VERY good growth pace.
Do a little extrapolation of the numbers and then talk about the "small portion or hardly anyone" sector that uses it.
And the over 600,000 visitors numbers refers to UNIQUE VISITS, this are tracked by IP and other factors.
Please be informed before stating your "facts"