You have to do it for many many years to build the amount of wealth you'd need to live a life of idle luxury
It's also very likely that people pulling $300k/year really like the work.
If you've never experienced burnout: it's not pretty, and can easily destroy your mental and physical health. At the first hints of burnout, you should get the fuck out!
1. The smaller group: People who do retire quietly. You don't hear about them.
2. The larger group: People who are capable of earning that salary are the type who can't just sit at the beach. Much as youth is wasted on the young, wealth is often wasted on the wealthy.
This might sound nice to many, but for it might be preferable to work on something meaningful as well.
You from a 3rd world country?