User blog comment:Tricoro/Poll 3: Favorite Upgradables - The Result!/@comment-25968376-20150315194130

A week or two after I got hooked on the game, I paid for the lowest amount of Crystals to support the devs (I'm a programmer myself). Later I did the same thing out of rage for accidentally using Crystals for some treasure that I should have upgraded with Coins. It took me way too long to realize that the first 3 upgrades for items were always guaranteed if you used coins, and now I have a Crystal Engine bringing me about 10 per day, so I guess I won't be doing the same thing again... yeah, I'm a cheapskate :P