If I'm understanding it right, you guys are saying that the show may decide to change material in the middle of the game based on the performance of the teams up to that point in order to make it harder for the team in the lead to win.
Not just harder -- impossible, or very nearly so.
Let's say a team sweeps Rounds 1-2 for 175 points (88/87). The resulting Double question, if swept, will award 124 points
at most. Essentially, the more a family wins in the first two rounds, the less Q3 will be worth if swept, and it will
never add up to 300.*
On the other hand, if the first two rounds are
not swept (or each family sweeps a round), the resulting Double question will be worth enough points that the game
would have been won if the first two rounds had
also been swept by a single family.
Basically, Q3 is never enough to win if 1-2 are swept by a family but always enough for a coulda-won otherwise...and I've seen this scenario happen way too many times for it to be accidental. The fact that they've even thrown out a Triple question because they didn't feel like programming a sixth question (i.e., double Sudden Death) just in case is incredibly lazy.
(* Yes, I'm aware that they've occasionally screwed up and allowed the game to be won in three rounds -- indeed, I have an O'Hurley episode where that happens. The problem with that is the last commercial break is
during Fast Money, not before or after where it would actually make sense and...you know...
not deflate the mood.)