I already have more money than I know what to do with. I'd rather spend my time on things I enjoy (arguing on HN) than things I hate (understanding or caring about the stock market).

It may not matter for you, and that's fine. But it matters for people who don't have more money than they know what to do with and who need to be able to fund a reasonably comfortable retirement.

Yeah, totally. If they have a stronger stomach for gambling than I do, they'll (probably...) reap the rewards, and good for them! But it's not for me.