Nice chart, but that just shows players playing online through Steam, not game sales.
According to Steam, we have sold over 11,000 copies through them. Since they will be paying us based on that figure, I'm not going to argue.
Not everyone has installed the game and registered an account yet. There have been 9572 new account registrations since we launched on Steam on the 1st of April.
Unique logins each day for the same period is between 2500 and 3500 players.
The number of players online in that chart are about right. Our figures are slightly higher, but that includes players who aren't using Steam.