So there is a golden guy named"The CrownMaster" he will give daily quests two in each world you can only take 4 of his quests a day in all worlds.The locations of him is,Commons,Oasis,the church in marleybone,jade palace outside,dragonspyre atheum,celestia spawn,zafaria shop area,azteca three points,the other world,final world (You get the idea)so depending on the world he will give harder quests and better crown reward so for instance he will ask you to defeat nightshade 20 times for 30-40 crowns in wizard city.In krok he will ask you to defeat serket 10 times for 45-60 in marleybone defeat meowtiary 15 times in a row for 50-65 and etc.
Lol when you are my level with my gear you will know how easy Big Ben is
The point is that it takes less time to do 10 trivia quizzes for 100 crowns right now than it would to do Big Ben ONCE. Your suggestion would take hours to less crowns.
Still, 15 times? That would take at least an hour or more. You can do ten quizzes with perfect scores in under 20 minutes. You just need to do it frequently and you memorize the answers eventually.
I wouldn't mind doing minor crown quests where you don't have to defeat someone x number of times. That really would take quite a while. But it would be something different to do in the game.