If you do not have any boosters, the levels become impossible to clear. Not all players can afford to constantly buy diamonds and boostrs and get stuck on hard and super hard levels for days. They have no chance of even winning some boosters in the competitions or events. I have never had a game like in the advert, either. But then there is enough players that can afford to spend large amounts of money to play the game, so the rest of the players do not matter.