You do realize that comment about training chicken dogs for folks and making a killing at it was a joke, right?As soon as you talk about training dogs for others you are in a much tougher realm than breaking them in for yourself. I can get my dogs to aid in defending my flock and even flocks of a couple close neighbors but once we get off reservation / dog's home range, the dog's relationship with poultry / livestock is much less predictable. My best dogs I have no problem with loading into a truck to get them into a new situation elsewhere. That is exactly the situation you are putting a dog into that is trained by one party to be subsequently kept by another party in a new location.
My approach to whole deal would be to make so that if I trained 10 dogs for others, 9 would get rave reviews with tenth killing chickens and causing me to take dog back. Costing would have to take that into account as that tenth dog would require additional investment and may never make in a situation with free-ranging poultry. Reputation would be something consistently at back of mind and that will come from feed back from others rather than my ability to sell my approach by actions of my own mouth alone with nothing to back it up.

