Interesting thing about us, people. If you put rats into a maze and reward them by placing cheese in random places around the maze. The rats will try their hardest to explore the maze to find all the cheese.
If you were to make a maze for people, and reward them with $5 dollar bills in random locations, we would act exactly like the rats. We would try to find all the possible bills.
Now go ahead and remove the cheese, and watch as the rats loose interest in the game. Remove the $5 dollar bills and watch how people coninue to play the game.
Old habits die hard with us, that's just our nature.
Moral of the story:
If clearly something isn't working, don't expect that it will suddenly start working tomorrow. Change it, in fact, do the opposite, break the loop, get the hint.