AskAboutMoney is unique in my experience of forums in that members can't edit their own old posts. At least I see no Edit button at the end of my old posts. A lot of postings could be sharpened up after solution and shortened by the members who wrote them. This means less space needed on the hosting server and less cost to the site owners. It also means a trend towards snappier scan of issues by users and admins. Any reason why not configure XenForo like that ?