Balancing an engine

It all boils down to: Do you feel lucky. I've built lots of engines. Some people don't have the money to balance an engine and they run from poor balance to good balance. Every engine I've had balanced is very smooth. I'll wait for the money to get all of my engines balanced. It easily pays off in quickness and longevity. Is it worth it? Do you want to tear down your engine again to have it balanced if it has too much vibration?