Is this just legalized gambling?
That's pretty much what people use stock market for anyway. Most investors are no warren buffet, they bet at best on educated guesses.
That's what I used to think until I began to understand (through Mr Money Mustache posts) that lots of people with large amounts of money invest (i.e. buy-and-hold) in the stock market because, despite the annual ups and downs, it has historical net annual gains of 7-10% over the last hundred years...