Discouragement post, don't waste your time on this quest

As the title says, the minimum requirement for the quest is to collect 500. First, clearing the game won't increase your gold at all. Second, the amount of gold you get will gradually decrease. Here are the results from my testing: Before collecting 40 items, you get 5 gold per item. From 40-80, it decreases to 4. From 80-120, it's 3. Finally, it's 2...1 gold. There's also an ad after every match, so you can roughly calculate how many matches it will take to get 500. It's really not worth it!