Daily Questing

Back before the Burning Crusade daily (or repeatable) quests did not exist as largely as they do now, they were mostly for reputation gains towards a faction or to make something happen in a dungeon in order to advance.

With the introduction of the first expansion daily quests were expanded upon to help provide currency gains to max-level players who wanted another way of earning gold pieces instead of relying on the auction house as many players had done before.

Patch 2.1 had brought the Black Temple raid and with it, several new daily quest areas in Outland. This would be the first of the many dailies. By the time 2.4 rolled around even more daily quests were introduced.

And so it continued.