We added spot leadeboards to the most recent update of eXtra Keno. This not only allows users to keep track of how many times they've hit a 2-Spot through 10-Spot, it also allows the rest of the Game Center community the chance to see how others are doing. Seeing that "suzyq1020" has already hit a 10-Spot certainly motivated me to grab my iPhone and see if I too could hit a 10-Spot (no luck yet).
Other notable mentions are "the cashew" and "turtleman74" for hitting a 9-Spot. So far, no one has hit an 8-Spot. Good luck to all the eXtra Keno players!
UPDATE: It looks like "queenofcubs" has also joined the 10-Spot club. Congratulations!