Quoted from dannunz:
Marco had a booth and game area wich looked like 10 Sterns. It's based on how many games they can pre sell at the show discount. Zap Con may have pramoted the deal better to increase the games purchased. But I don't have any first hand knowledge of the details.
Looks like Zapcon had 23 new sterns set up, here’s a pic of them setting em up.