That's true. I feel like the important bit is covering the essentials. 2x more is not 2x better, but you need to get above a certain threshold.
Incidentally this also holds for some engineering metrics. Some error metrics stop making sense after a certain threshold. E.g. if a certain error becomes disqualifying, doubling the error changes nothing.
Some study released years ago gave a USD value for the salary that was the happiness asymptote. Recent inflation has likely demolished that number, and I think it is an important one to know. It did not speak to the case of not needing a salary at all. The ability to be idle, or seelf direct however you want is very enticing, but I could see it going badly in a number of ways.
Incidentally this also holds for some engineering metrics. Some error metrics stop making sense after a certain threshold. E.g. if a certain error becomes disqualifying, doubling the error changes nothing.