That is the basics of Capitalism, not to spend profits but to put it to hire more people, get more profits from more sales & just keep doing over & over. This is how they get so rich.
Why is having more money a problem again? Because there's less for the poor if they have it? Either inflation ensures there is money to pay them or deflation makes it more valuable.
More $ devalues existing $. This prevents poor from saving. While it devalues $ of the rich also, their $ is increasing more then devaluing. It means rich get more % of $ over time.