I am close to resetting, so I'll let you know, but keep in mind that it depends on the chapter you're playing. Different chapters start off with different monsters which give different base amounts of gold. So for the purpose of this challenge, might want to specify which chapter and which area just to make it clear. I would suggest...

-World's Wake (chapter 1)
-Area 1
-Level 1 Bush Whacker
-No other crusaders bought
-If treasure chest, then give results while noting that it was a treasure chest, considering there would be no real way to tell what the next non-chest monster would have given you.

HOWEVER, considering some people might not want to spend time in chapter 1 during an event, have people still do the same challenge as above, but in the event area 1, etc, and note that their challenge was done in the event area. I will edit this to include my results for the challenge when I reset and do the event area. However, considering how quick I can reach the reset skill in chapter 1, I might just do both. But that's just me. Not everyone might want to do that, but I'm curious what the level-quantity-specific difference is between chapter 1 and the event area.

Gotcha. I have actually never touched Amusement Park of Doom yet, so might as well do the first objective while doing your challenge.

I clicked once and didn't kill the enemy in a single click, so I clicked a second time, which killed it. With 1.07mil idols and no gold buffs, my BW was able to go to level 69.