As an experienced tourney DM, I can tell you that the "mission" of virtually every tournament adventure is to finish. Traditional scoring is weighted for progress and survival. 'Looting' this tomb is mostly color text; you might get bonus points for collected GP value, but they will pale against the score you'll get for finishing alive. You're competing with other groups at this event (we're at a con, remember?), and jacking around with a transitive room like this is asking for punishment.
I think this supports your general thesis about the intent of the trap; give them 1 round/turn to make reasonable searches and move on. After that, the gloves come off. That's not exactly what the text says, but its a practical interpretation for a tourney.
Searching, ("looting"), the tomb is not color text, it is *required*. The PCs have to search for secret doors, for traps, for keys, for clues in every area. The PCs can have no intention of taking treasure at all, and they still have to search and examine and explore everything.
They CANNOT just move on forward and ignore everything else. In the previous room, they see the exit way immediately, and they could just march on out. But then they miss the two parts of the first key.
Saying that something in the Tomb is a punishment for wasting time searching things is absurd. The Tomb requires taking the time to search everything. If the PCs don't take time to search everything, and they miss keys and such, and can't move forward, then people would say, "Well you shouldn't just rush through the Tomb."
You're competing with other groups at this event (we're at a con, remember?), and jacking around with a transitive room like this is asking for punishment.
The Players don't know what is a transitive room until they search. Groups in the tournament who get stuck at some point because they missed a key or clue earlier will lose, while those who took the time to search everything may get through and win.
Basically, the argument seems to be that searching is a waste of time except when it isn't; don't waste time searching except in areas where you need to, (but you don't know what areas you need to search until you do search). You'll run out of time and loose the tournament if you waste time searching, but you'll hit a dead end and loose the tournament if you don't take the time to search.
Bullgrit