This may help.
Let's say you and I buy a PowerBall ticket together. We make an agreement that if we win, we'll start a business together.
We win! We now have millions and millions of dollars. I propose a business plan: gold-plated fireplace logs, very fancy, $600 a pop.
You think "wait, you expect people to pay $600 for something they literally burn up?" I say, "YUP!"
Do you proceed?
My guess is you don't, because you rightly think "nobody's going to buy that, I'd rather keep the money."
Congratulations, you just found the really #$!@ing obvious flaw in supply-side economics!
Businesses do NOT expand or entertain new ventures simply because they have the money to. They expand or entertain new ventures in response to DEMAND. The best way to stimulate the economy is to give more money to people who don't already have it, so they will spend more.