If you play moderately, it accumulates

I've cleared over 100 rounds a day before. By only doing the gold missions (Volcano 7 times, Stone Bridge 5 times) daily and skipping the rest, I've accumulated a ton of gold and items. I originally had over 400k gold, but I got greedy the week before last and spent it all lol. I guess I'll just have to save up again, get a little greedy, and then save up again ㅋㅋ