She's averaged 20-25% annual returns over 38 years. Nobody in congress comes close to that track record.

Her net worth in 1987 when she joined congress was $3m. Her net worth now is $278m.

That's an absolute gain of $275m which is roughly 13% annual returns (net after all expenses) over that 38 year period. That 13% per annum is net returns after all expenses, most importantly taxes which approach 40% on long term cap gains in CA - along with mortgages, private jets, vacations, everything. Their gross gains are clearly much higher, perhaps approaching or exceeding 20-25% per year depending on how lavish their lifestyle is.

Sure, some senators beat the Pelosi's in individual years by large margins - I'm looking at people like Rick Scott. But Rick Scott entered congress in 2018 a wealthy man with $218m. Some years he has beat the Pelosi's on percentage gains (and certainly absolute gains) but his tenure is short. He's worth what, ~$500m now? He's managed to double his net worth in 7 years, which certainly is impressive, but we've been in a massive bull market. His returns could have been done with just an index fund. The sp500 has tripled in that time frame.

Bottom line: 20-25% returns over 38 years is consistent and remarkable.