It provides a reason for them not to just “take their ball and go home” once they have a pile of money.
If that’s the reason for it it’s not doing its job. Investments are much like savings to high net worth individuals and their investments are managed by someone else and they simply lay in the cut and collect dividends. Yes there is a risk to investments but if you’re in a good wealth fund then over time you’re almost guaranteed to win even if you have disastrous months here and there.
Always. If inflation runs away, the poor suffer. If we get stuck in a deflationary cycle the poor suffer. Apparently it is impossible to construct an equitable system that works without gross inequality (spoiler: it isn’t but some people love inequality and will do anything to prevent things being distributed more equally.)