Or trickling from the people who do nothing to the people who have to produce something nice for the lucky ones to buy. From the non-workers to the workers.

For capital gains, doing nothing to earn them is the rule. The fact that economic activity doesn't appear out of thin air and that someone has to pay those capital gains either by foregoing income or through higher prices is usually forgotten.

What really disappoints me is that Marxist don't follow a very simple idea, let profits and capital gains reach zero through market forces. That would fulfill the spirit but not the letter of communism.