I believe this is mainly due to malfunctions or time consuming modifications. We had 2 matches we actually bolted our wheels so the couldnt turn and just set ourselves with our claws facing the goals. Our alliance gave us 1 goal and we held it in the endzone out of the goal scoring zone. We couldn't be moved and won both matches.
we also had a match where our lexan took such a hard shot it hit our RC and we had to get a replacement.
I havn't seen any teams disabled by the judges, mostly things just get bounced loose.