As I understand it the costs of arbitration are usually split between the plaintiff and defendant. However, your point may still be valid because the corporatio

As I understand it the costs of arbitration are usually split between the plaintiff and defendant. However, your point may still be valid because the corporations are often repeat players who wield more influence. On the other hand, if an arbitration was biased then the plaintiff could petition a court to disregard it and allow a regular suit to proceed. So arbitrators really do need to be unbiased.