It's not just literally true - you can exchange money for raw materials and energy (power), but every time you give money to someone else to do your bidding, you are exercising power over them.
The only time this power is not really being exercised (as in "power over other people") is when you're spending for your own pleasure, buying things like a new car or a spa visit. Investing money is almost always exercising power, depending how much and with what intent you will affect future of others. For example, you can buy a newspaper company to make good PR about you.
So to be able to "destroy the power", in capitalist society, you would have to very tightly control how people spend money. This is not only fiendishly difficult, but also undesirable from a free market perspective.
Reducing inequality is a much simpler way to remove power from too powerful people, because it simply gives more power to other people. And there is in fact not much need to be wealthy in the first place, unless you can have associated power - there is only so much cars one person needs.