I agree our life in general is a pure gamble, we make choices, we take risks ... but gambling your money is not something that would help you make steady income.
Google takes risks, when it tried to reach more countries, it took risks, but these kind of risks where not about pure randomness.
With sports, there is also some less "randomness" which you are referring to, but in the end of the day - the outcome is still much more random than you investing and giving it all to a business... of course everything can fail or win... but to pick 100% winners without losing or losing very few ones? how many people can do that?