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That is great to hear, it means that if you have higher level monsters you'll go further than even the Diamond league.

Yes. But as you said, it gets really expensive at some point xD

Yeah @cwow2. But you've got to consider the cost and benefits.

At top level you earn more DEC and more cards for completing your daily quest. At Diamond I, I am earning enough DEC to buy the quest potion which gives me extra 5 cards + the 14 cards I get for completing the daily quest and that brings it to 19 cards.

But was that been worth it yet?

For me it has really been excellent, I get an average of about 17 cards daily and 60 to 80 cards at the end of the season. i get loads of Gold and Legendary cards so can't complain. Cheers.

Thats quite nice! :D