The arbiters know which side of the bread is buttered. An arbiter who rules for the consumer too much finds himself out of work. You better have an ironclad case if you're going the arbitration route.

There's also the ban on class actions--effectively meaning small things become legal because very few will fight when the cost of fighting is more than the expected recovery. (In some places the government is guilty of that, also--the cost to contest a ticket may be higher than the cost of the ticket and not recoverable even if you win.)