[QUOTE=MutantKid;208751] Some quests are not worth doing at all, due to in-game economics. TSO values gold coins far lower than the in-game trade market does. And same with other resources.
Hence, you will probably want to cancel some quests where the reward is less than the investment.
Similarly, you'll want to cancel some quests that take way too long to complete for such a meager reward. Especially if you are missing out on other daily quests.