This is the way of pleasure. It is unfulfilling. Pleasure is for the moment, at the cost of the future. We enjoy the moment of pleasure, but are left thirsty for more. When the moment is gone, all that is left is weariness and frustration.
Pleasure promises more than it can produce.
Its advertising agency is better than its manufacturing department. In and of themselves, there is nothing wrong with pleasurable experiences. Christians should enjoy life, enjoy God's creation. The problem Solomon faced was that he was looking to pleasure as the end, pleasure as the provider of meaning in life. Then you reach a point of diminishing returns when there is little or no enjoyment at all, only bondage.