Why Jerry Seinfeld went out on top: http://www.lewrockwell.com/2014/07/james-altucher/how-to-go-out-on-top/
I've seen every episode of Seinfeld multiple times. For years I even put it on as background "music" to fall asleep to(with the monitor off). I have a lot of respect for the show and the cast. George Costanza is still the greatest comedic TV character ever created if you ask me. They ended the show at the perfect time. Watching the last season, and even the 2nd to last season, you could see the writers needing to stretch things into an increasingly absurd direction, something you see happen in almost all TV shows when they've exhausted all their core ideas. They ended the show before that got out of hand, going out "on a high note" like George kept trying to do at Kruger Industrial Smoothing.