I agree with what most has been stated above, however, I do not have any problem giving them out. The catch, they only go out to people I KNOW can handle the non-rev operation and are extremely flexible.
The people I have given passes to are mostly former airline employees and a few relatives that are grateful to get them. (My travel companion is a former inflight crewmember with us). They know my job is on the line if they misbehave. I also make sure loads are wide open.
Good luck!