So let me break this down so it's infinitely clear.
First, let's back the bookies take out of the equation.
If odds are set correctly, and do reflect reality, then you can bet an underdog or a favorite every day, even every hour of the day, and at the end of the year your balance will be exactly as if you flipped a coin and were paid out 1 dollar for every dollar you bet. That's a 1/1 risk reward.
Now, if you throw in the bookies take, your balance will reflect exactly as stated above, minus all the commissions/vigs you gave away to play. (Pay-To-Play, sound familiar?)
Thus, if odds are TRUE, your risk to reward is indeed 1/1.
Since the odds are true as you say and/or advise, why don't you have a bet down?