Let me rephrase it. I have worked in the judicial system before and had commentary from judges. Essentially what they say is that they recognize they're all fallible, and they sleep better at night knowing that their decisions can be appealed to a higher court in case they make a mistake, because all judges will make mistakes.
I guess the members of the judiciary would be very much aware as to what happens with no internal appeal provisions.
Coming around another way, and perhaps this question should be put to a judge from the Federal Court, if there were an appeal process within the IRB, then it would seem that instead of hearing 6,000 or 7,000 cases in one year, they probably would end up hearing fewer cases.