What you fail to realize is that the wealthy are not dragons that sit on their piles of money. Money has no value until it is trading hands. The "wealthy" do 2 things:
1) Spend their money
2) Invest their money to... MAKE MOAR MONEY!
Both these actions create jobs and spur the creation of businesses to produce things to be acquired and or consumed, and pay employees to produce or for services. Employees make money, investors try to invest wisely to make a positive return on the money invested, everyone wins with ZOMG! TRICKLE DOWN!
Money hidden under the mattress does no any good.
I agree that money only has value when it moves. But making more money does not necessarily create jobs. It might. Or it might not. One might make more money by doubling widget production capacity with twice the factories, twice the labor, etc. Or one might make more money by finding a way to make the same number of widgets with less labor, thus increasing profit. Maybe it's some of both. Money does not care how it is made. Capitalism means getting a return on capital. Sometimes the side effects of returning value to investors benefit those without the capital, too.