It is a valid question to ask why you are charging a certain price when others are charging a lower price. If you feel your price is appropriate then you should respond to then why they are appropriate and any potential customer can see both of your arguments in a transparent way.
You want a fair trading environment but also want to let people operate on this forum as if it were 4chan. I am not claiming the thread itself is my property, I am claiming it SHOULD be, at least within the confines of the marketplace section. Even if every single marketplace posting was self moderated it would not stop others from calling out fraud or abuse elsewhere in the forum. Additionally it costs you nothing to allow people to harass me, therefore you have no interest in protecting me to begin with, and neither do the mods.
However there is plenty of incentive for people to drift from thread to thread and pretend like they are righting wrongs so they can look like social justice warriors and also entertain themselves with trolling in the process. People can cause harm with their words and by invading and hijacking otherwise productive threads. These people thrive off of destroying the work of others and due so under a guise of pointing out a wrong to put their victims on the defensive from the beginning of their perpetration of this harassment. This will continue to be exploited by disingenuous people until the moderators and staff correct their failed attempts at moderating trust in any way. As long as you comply to it, they will keep harassing then demanding the staff correct it for them. Neutral trust isn't going to fix anything, because the problem isn't the trust system, it is your attempts at moderating it. Staff/moderators your strategy is a failing one. Unfortunately you decided to punish me and others instead of accepting that fact.