I would have to agree with many others on key pricing. Or at the very least a lack of scaling of their costs. Giving a ~lvl10 a chest they can't open without paying is a bit "ridiculous". Saving the chest is not much of an option either, by the time they have the gold for one rare chest(or a ranger) can have 10 rare chests and would need to have past up many more common and uncommon chests.
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Thanks for the feedback! We agree there's still some balancing to be done.