Sure, if your house increases in value it is in fact not creating any value. Same with stocks. But if you invest in stocks you increase the amount of risk capit

Sure, if your house increases in value it is in fact not creating any value. Same with stocks. But if you invest in stocks you increase the amount of risk capital in the world, so more companies will be started, companies that can create value. So it's not the rising stock price that creates value when a company is successful, but is an indication that the company is creating value, since people are buying its product.