Most people in the US would be delighted to have over $200k of gross income, much less after paying for taxes and housing. Your argument seems to suggest that those developers should also be very happy with their incomes.
The argument isn't that they're unhappy, it's that most of them are not decamillionaires, despite what the GP I was responding to seemed to believe. Post I was responding do originally implied that earning 500k for 20 years was enough to make someone a decamillionaire, but edited to account for taxes and cost of living now.