Let put it the other way, you don't get 20% chance of each try to success.
You are getting 80% chance of each try to fail.
So instead of 20% x 5 = 100% success in RE. You are facing 80% x 5 = 400% FAIL!!! in RE.
Does it make you feel you were actually very very luck to sucess in only 1 out of 10 attempts now???