This is the first time I wrote a post, so it can be ridiculous. Ever thought of earning fast crystals? You can earn 3 crystals in some quests, but what if you finished all the quests? So I'm thinking that the KAW developers should create a new Epic Battle that gives crystals depending on your participation. That way everybody could earn fast crystals and regen faster. Is this post ok? If not, you are allowed to criticize me in the comments. Thanks.
First, you can redo quests and still get crystals, just less. Secondly, this would lose the devs money most likely and so will not happen. Thirdly, I'm afraid, NO.
Crystal and nobility point sales are the devs main source of income, why would they make it easier for people to get free things? You can still get crystals from completed quests but the rate is very low. Use them carefully, instead of blowing them all fast. You can also get some when you buy propacks.
Over my resets and before them I have done thousands of quests and not received them from completed quests... This seems like a lie 0.o