I get that the shut up and multiply calculation will make it worth trying even if the odds are really low, but my emotions don't respond very well to low odds.
I can override that to some degree, but, at the end of the day, it'd be easier if the odds were actually pretty decent.
Comment or PM me, it's not something I've heard much about.
Depending on the formality and requirements to qualify as "Friendly" as opposed to just "doesn't destroy humanity pretty quickly", I put it between 0% and 40%.