This is a tricky question for me because on one hand I am aware of the secret in life. However, the realist in me thinks that being overly positive while gambling is probably not the right move to make a majority of the time. The secret is hard to deny though, as I myself have found me to be a beneficiary of its awesomeness.
Don't mix happiness that anyone can be happy there are days that you are naturally happy and that will affect what ever that you do but it should not be confused with winning in gambling because positivity and gambling is not related