Enlightenment begins with a desire to achieve it, but what does it end with? Not very many of us know the answer to that. I, personally, am a fan of desire, and living the life of a Buddhist seems very undesirable to me.
A lot of people claim to know the answer to finding happiness, joy, or whatever ultimate good they believe in, and Buddhists, or those that adhere to Eastern philosophies, only make up a fraction of them. Yet everything that all of them claim to know will only be condensed to pondering material for me. My life is my own and I've got to find my own way, as they all have. If this means that I'll just be born again and again until I get it right, so be it. Until then, if it ever happens, I'm very happy with desire.