I agree however it was Cargo's question that still has not been answer in monetary terms.
Like 1 million, 5 million, 10 million plus ?
Just for you - I did some research. According to 2019 data, there were approximately 31,000 people living in Poland that earned more than 1 million that year. This was defined by the person's tax filings, and the amounts concerned are in zloty. TBH, it seems wrong to me that there are only 31,000 people in Poland earning more than $250k a year, since the evidence on the streets seems to indicate otherwise, as well as my own anecdotal experience - but numbers are numbers. For total net worth, we have international consultancy Capgemini to thank, and it reports that there are more than 150,000 dollar millionaires living in the country.
At the top end, looking at Poland's annual list of 100 richest people - it looks like you needed to be worth at least $90M to be featured in that list in 2019, which is $9M more than the year before.
For context, the number of dollar millionaires in Spain (rough population equivalent) is 1.2 million people, is 250k in Russia, and 22 million in the USA. The entry price for the annual Forbes 100 list is $150 million in Spain, $1B in Russia, and $6.5B in the USA.
Overall, I think one has to say Poland is doing just about how it should be doing given its market and population size, and the all-important fact that it has been integrated into the world economy for just thirty years.