Yesterday, I spent 8800 ingot to buy cave key pack x10 (I got 880 points.) Hope that I will be one of the lucky players who get the Today's Prize which are the gold essence. However, luck is not on my side I didn't get it and I see some lucky players who didn't spend ingots that much as photo shown below. Therefore, my tip is that it does not matter how much ingots you spend. Just spend some of it and pray hard to Lord Fukurokumaru lol

( my current ingots spending)