You remember back in the early days of video games when there wasn't enough capacity on the carts themselves to support 30 hours of gameplay? What was the solution to keep you playing? They made the games unbelievably freaking difficult. Try playing Kid Icarus now after having played a modern game and you'll see that the game introduces artificial barriers and creates needless blocks simply to increase the amount of time spent in the game. If you're an MMO maker and you charge a monthly fee, the more time people spend in your game the more money you make.