High income brackets are vastly higher incomes so people at low incomes (~30k) rarely reach that level. In 2020, the top 1% was $531,020.00 / year, that’s rare, 2% is $387,116.00 again a huge jump for most people.

However, some people very briefly enter high income status via a windfall. But, even here it’s mostly people with high incomes rather than poor people winning the lottery etc.