Around this topic, just saw an
interesting article on Jay Leno and how he has never spent any of the money he made on the Tonight Show.
Basically, his entire life he has had two jobs, and would live off the lower of the two and bank the other.
When he started, he worked at a car dealership, and did stand-up. He lived off the stand-up money and banked the dealership money until the stand-up/comedy money exceeded the dealership. He then lived off the dealership money and banked the stand-up money.
Once he ended up on the Tonight Show, he continued to do Stand-up (100 nights a year), and banked the Tonight Show money. He now does Jay Leno's Garage, and Tours living off whichever produces the lesser income.
Wish I had thought of that 40 years ago...