Look, here's a thing. 40% of all land in England is owned just by around 200 families. And they are laughing their arses off when they hear that peasants earning £181k per annum are rich.
Do you understand that your logic doesn't make any sense? First of all, half of their income goes into taxes. Second - they still need to spend money on bills, food, etc. So it will take them a lot more than 30 years to get to £10m. They won't live as long.
You're also confusing top earning workers with the rich.
People on PAYE are not rich.