Because shares are no longer about investing in a company that is making healthy margins and has a solid business, that will pay you a decent dividend in return for your investment.

Shares are a short-term speculative gamble; you buy them in the hope that the price will rise and then you can sell them for a profit. Sometimes the gap between these two events is measured in milliseconds.

So the only thing that matters to Wall St is growth. If the company is growing then its price will probably rise. If it's not, it won't. Current size is unimportant. Current earnings are unimportant (unless they are used to fund growth). Nvidia is sexy, Apple is not, despite all the things you say (which are true).