Its all documented pretty clearly here:
http://www.flyertalk.com/rules, under the section "Actions That Will Compel FlyerTalk Intervention".
Having said that, each forum has its own "intervention threshold". Some of what you've illustrated may be acceptable in one forum, but not another. Premptive action is always a judgement call by the moderator. A complaint from a member makes will alway cause investigation...
[This message has been edited by skofarrell (edited Jan 23, 2004).]