I think the refund system is a legal requirement for low-friction in-game/app purchases in general, so should stay the same. So if you got a dud package you could just refund and try again, refund and try again, refund and try again... Hence my question - what's the point?
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Hearthstone has RNG microtransactions as well, and I don't believe those are refundable. It's been done before, it just hopefully won't get done here.