> The real problem is: This additional freedom you can buy with money means less freedom for somebody else.

There are three wrong assumptions here: 1) that wealth is zero-sum 2) that wealth is the only possible way to obtain freedom 3) that for each individual the same quantum of wealth buys the exact same quantum of freedom.

Prime-facie, neither of these three are true.

There are all kinds of problems with associated with inequality (and the literature is far too rich for me to go into detail here), but this isn't one of them.