I can understand your frustration with the show, but I have faith in the writers.
They have an endpoint. They're operating within a set of rules. It's just that the island is full of mystery.
Supernatural, in a way.
Pfft... excuses excuses
Don't get me wrong, i love it at times, but some episodes just drive me insane because if they didn't exist, nothing would change to Lost as a show. Heck, if some episodes never existed, the show would be much more coherent!!