I believe that you are responsible for any damage that you knowingly cause, be it emotional or otherwise.
To clarify: I define "damage" here as the difference of expected values to the optimal course of action.
You are allowed to include yourself in the calculation.
Bet with PeH:
I win if Arms sells over 700 000 units worldwide by the end of 2017.
Bet with WagnerPaiva:
I win if Emmanuel Macron wins the french presidential election May 7th 2017.