No.
Grinding on hard/lunatic (kinda ruins the point of going lunatic but whatever floats your boat) is best done on dlc maps. There is a dlc map (not released yet) that gives a TON of money. That wont be out for a while, though.
For now, both the free dlc & the roy dlc have 2 villages that give you random items. Should be able to sell them for 200~800 gold a pop (or keep) and the map (especially roy's) give good exp. It feels dirty, though.
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