H.G. Well's "The Time Machine" comes to mind, in a broader sense. The Eloi get everything they could possibly want - a stress-free life, the ability to pursue their every desire and whim with no consequence - but at the expense of the back-breaking labor of the Morlocks. And what is the point of that lifestyle if there is no yin to that yang? As writers, we have the responsibility to make the readers earn their sunny outcome by dragging them through the trenches in order to get there, because without that struggle, the payoff is worth nothing.