My uncle was sparks, best mate also a sparks, used to share the guys between jobs to keep them busy. John decided to step change and go big in business, but stress caused massive health problems early heart attack. He did get to retire rich but was fckd, and died early.
Uncle is way past 80, fit as f**k and very happy. Made enough to retire very comfortably and spend 1/2 year somewhere sunny.
At 80 he was still climbing onto his house roof & along the ridge to sweep his stove chimney, told him to quit that and call me instead - never called.