I would need to check, but I think New Members can't edit posts, that should be it though. Except for me as admin - I can edit a post at any time (otherwise there wouldn't be much point being an administrator).
GP The following post was created Yesterday 11:23:28 last edited Today 19:37:11. This is 30+ hours. http://forums.silverstackers.com/message-180712.html#p180712 It would appear that some cna edit and some can't. PE
Trying to find the announcement post, but this was introduced last year - trading threads can be requested to be unlocked for price editing, via the Report function.