Been running standard chains for 30 years. I lube them and have only had 1 failure. I change them and sprockets at the same time when worn. I don't think you get extra life out of a sealed chain unless you are lax about lube or live in a very abrasive enviornment such as sandy or dirt road.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!