The top five US public companies are Apple, Google, facebook, Microsoft, and Amazon. Three of them are HQ'd here. Netflix isn't top-5 by market cap but I wouldn't be surprised if it gets there before long, maybe displacing Microsoft.

You can certainly make that argument but it's on a whole different level now. Apple is earning 60-80 billion in profit per quarter. Many of the companies you list don't even have market caps that high.