so...if ferry flights are 'reward' because they give you PIC time - but... what if you dont need PIC time, say you have tons of hours - then its not 'reward' is it?
free flying cannot be considered 'reward', because it depends on the individuals circumstances.
if an owner said "you can fly my helicopter and i'll give you a slap in the face too", then the slap obviously isnt 'reward', unless the pilot likes slap in the faces, then it is 'reward'
see my point?