Greetings everyone, I'm here to show you if my season was worth it or not.
Previous two seasons (I started near the end of one), I ended in Bronze III and Bronze II, so that was 5 chests and 7 chests, respectively.
This time, I did the following: I played through most of the season on Bronze III, but reaching above 1000 rating. Then I rented a card for 125 DEC that gave me enough power to reach Silver III, therefore getting 12 chests.
Here's what I got:
So that's 68.574 worth of DEC in cards, plus 84 DEC, and 35.779 worth of DEC in potions (if you bought them with credits).
A total of 188.353 DEC! Which is 63.353 DEC more than what I paid to rent that card. If I hadn't done that, I'd have received only 5 chests. Depending on what my extra 7 chests turned out to be, it was a good investment. But if I had received those 2 cards anyways, then the investment didn't pay off.