Chance doesn't abide by laws
Probably just bad manners.
Pardon me, the laws of probability do not cover a coincidence of this magnatude.
I have played 6 greeter games...1 player made 1 move...it seems only a small percentage of people go on to play here on a regular basis...
That's true of every website. A lot of people join in a flight of enthusiasm and never come back.