Arbitration only works if both parties are at least somewhat co-operative with the process. If someone decides to just not co-operate with the process or actively impede it, you need to escalate far beyond arbitration, which gets very expensive very quickly (with maybe some small chance that if you can pay for it, you might be able to get some of it back at the end. The belligerent side is generally just betting you'll run out of funds and willpower before you get there).