Case filing and responding are free for all participants. In addition, you can use SquareTrade's Direct Negotiation tool free of charge. You will be charged only if mediation or review service is provided at your request.
Without mediation or review you get nothing (for nothing of course). The other party only has to respond, if they agree to mediation you lose your money and they turn down your request for mutual removal.
You can do exactly the same thing for free through eBay if the other party does not agree I doubt ST would be any more effective.
In the one case I had with an ST dispute filed on me by a wacko NPB I made sure they paid their fee and also some other extra charge because she ended up with both mediation AND review. If she had only just said right at the beginning "sorry thought I was bidding on a cd not a record" I would have done a mutual and left reasonable feedback, instead she chose to go the full on offensive assault route.
Read the fee disclaimer, they provide but they don't have to succeed.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.