Then take a look at California Labor & Employment Law Blog's Is Arbitration Good or Bad for Employees?:
"This question is often debated among attorneys, judges and arbitrators. Judges like arbitration because they’re chronically overworked. For instance, the U.S. District Court for the Central District of California had the honor of being the second busiest federal district court in the entire country, with 11,585 civil cases filed in 2006 alone. Judges view arbitration as a way to get disputes out of their overburdened courts. Arbitrators love arbitration because they charge lots of money. And some (but not all) defense lawyers like arbitration for exactly the same reasons most employees should run away from arbitration"