Maybe your players couldn't join a quiz at a scheduled time. This is a disappointment for a player who missed all the fun, as well as for you - because you lost the opportunity to connect with them, gather their contacts, etc. Quizzes at myQuiz shouldn't be deactivated! That's why we brought to you the Single Player feature.
In Single Player Mode participants play games on their own time, and still compete with other gamers. In this case, quiz results are recorded in a leaderboard, and later, you decide how to determine a winner (say, use randomization to make cheating useless).