Five trust levels may be adequate for a technical forum, but are not adequate for a social forum. Reading through the posts here they are way too ‘technical’ for the average user…and as such in my opinion should not form the basis of any social forum. It is uninviting and very demeaning to the average visitor.
FYI…in no way is it acceptable to punish someone by lowering their trust level. If they have proven their status then they have proven it. People have lives and do not live online. Punishing them for this and removing their trust level is fundamentally wrong.