luck is random, if it was pure luck, 20% of the time you would get the top hero. and the gold and purple heroes would come out more frequently. The only luck element, is if you try it at the time they chose to pay out, that is luck, the rest is pre-ordained. Simple maths probability theory would prove it very easily. They truly on people who get an occasional good run to keep trying. it is as random as slot machines. have you ever seen a poor slot machine owner?