To be fair, the Chipmixer campaign (and probably others as well) had the same rule and it's ambiguous.  Sure, a thread with thousands or even 100 pages is a mega-thread, but what about one that has 30 or so and is growing fast?  I'm not arguing against the rule, since even a 30-page thread probably isn't worth posting in unless it's a well-known one like the WO one, but it's definitely open to interpretation on the manager's part and confusion on the participants' part.

A good rule of thumb is that if you trust your campaign manager, don't keep protesting uncounted posts if there's a rule like this one.  Or maybe I'm being naive; there's always the possibility of that. 

Props to you, icopress!