Starcraft 2 and MLG Tournament Play

I was just watching MLG Raleigh this weekend, and I was struck by the fact that many players go into their second game of the same match with an idea that they are going to try the same strategy again.  I have seen at least two examples where the players made the same mistake in two back-to-back games.

For example:

• IdRA makes too many Mutalisks and loses to a superior Marine-heavy ground army.
• Players quit too early
• Players make an assumption about what the opponent will be doing, and don't bother to scout and check

On the ladder, using the same strategy or build repeatedly doesn't really matter - your opponents aren't exactly going to catch on.  But in tournament play, change it up.