Enlightenment is not joy and yummies, it is the green mile. At the end of that path lies the permanent cessation of who you thought you were. Lies are dispelled, illusions seen through and a great lethargy can overtake you for the first few years after the disolution. After all, you have just learned that everything you have ever believed in is bullshit, it is really hard to "buy in" again after that.
People need to move beyond the old way of understanding purpose in this world. The Enlightened state is beyond human characterizations of meaning and purpose. The Universe existed for billions of years before man invented meaning and purpose and will exist for billions of years after man has returned to the dust. The only thing Enlightenment is about, is this very simple and clean fact: Enlightenment is existence in the Truth, that is all.