Unpredictable, credible numbers is motive
For the first example
"What is the traffic accident number of New York on Tomorrow?"
This predicts the last one digit number.
[odd / even]
The probability is 50%
another example
Tomorrow Nasdaq Composite Stock Price Index last digit numbet?
1~10 or [odd / even] The probability is 10%
Is not this game funny?
Nope, it's not funny to bet on odd/even on 1.80/1.80 odds. This is 10% house edge.
Also, those events are semi-random. Depending on stakes, they could be manipulated. Not likely, but possible.