Hastar is not a human or even a cursed human. He is a demon god. He is cursed by all the other gods and hence living in protection of his mother's womb.
Previously he tried to steal all the gold and food from his mother but could only take gold.
Gold here does not mean anything for him. He just wants every object to be his. It does have value for humans that's why they are tricking him by giving him food and trying to get as many coins as they can.
He does not know the language or transaction and neither wants to kill anyone. But when he touches a human, his curse of living eternal life as diseased is transmitted to them.