No one is forced to appeal, but even an ardently pro-SS person like me thinks that the opportunity to appeal is an important safeguard to protect the rights of the accused (and thereby strengthen the legitimacy of SS).
If you want to avail yourself of an appeal of your SS sanction, you, the respondent, must pay for the arbitration yourself. So you pay JAMS, not SS. The point is that the cost of arbitration of a SS sanction is borne by the respondent, not by SS. (Except in the case of hardship or if you win the appeal.)
I have no problem with the respondent paying the arbitration costs, as that creates the right incentives, and the alternative is that the costs are paid by SS = taxpayer = me.
But there are fees. Of all of Bonnie Navin’s complaints, this one is basically correct. If she is morally outraged that the accused pay for their defense and arbitration, she can channel that outrage into Go Fund Me campaigns to raise money to pay her to defend these people. All of that seems harmless to me.