In any group of 14, there are bound to be a few. Like almost everything else in life, it's a bell curve. There will be 3 or 4 really good players of varying ability, 3 or 4 really weak players, and 7 or 8 who are average. That's why they invited you. The suckers eventually get cleaned out and stop playing, so the game always needs new blood.
Not to imply that you're one of the fish, of course..... :p
