Is this quest just for show?

I saw gameplay videos from others, and each stage only gives 3 Gems. The minimum quest requirement of 600 seems a bit difficult. The highest quest is 50 'million' which is 'three little', is this basically just for decoration, or has someone actually obtained it? (I personally didn't play because I found the quests too difficult, so if there's any mistake, please disregard what I said.)