There are NO
The only Moderators in Equipment Exchange handle feedback and comments ONLY.
You are complaining to staff.
I would personally recommend IMing staff member in question (Kevin, Stokes, Aimless), as listed in forum listing for options, as to why something was trashed.
I will tell you the reason a thread is trashed when locked - Marketing.
Look at the views/day of a General Discussion thread, then look how the views of that thread DOUBLE or more once it has a padlock dangling from it.
When I wanna sell something in EE, I keep thinking of new bribes for staff to lock it so it can get sold. They don't sell out though.
Rules are clear and evenly applied as well as under a handful can handle it.
Again, IM the staff member you are having issues with, if that doesn't result in anything, try a different one. Complaining about it here? Well, I try to stay unbiased, but I am not so sure about the rest of the folks browsing.