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You are wearing blinders if you think investment has no relation to betting. The very reason there are different kinds of investments with different interest rates is because some are riskier than others. Risky -- an interesting word. Implies something might or might not go as planned. Implies you might be betting. Implies you might lose.
In both cases, the investor and bettor try to make the best choice they can. Whether it's betting on the spread of a game, a 100:1 longshot at the track, or a subprime mortgage, it all comes down to analyzing the situation and making an informed guess. Some guesses are better informed than others. Chance always plays its hand too.
Betting, it's called.