> I didn't invest in your fortune 500 company, I bet on the idea that other people down the line would bet on the same company but that they'd bet even harder.

The stock price does connect to the real world though. If a company is deciding whether to expand, or bring in new management, or exit an industry, their stock price will certainly factor into that. If they're looking to buy another company, or another company is looking to buy them, the stock price is even more relevant.