Why do people use help dogs?

Some good responses. Which brings me to another perspective on it. I don't "breed" for help dogs, they are what they are, dogs pick the job they want to do and to what degree they perform, and I have only a few that are what I call help dogs, I have "alot" of dogs. When I have a one or two certain dogs on the ground all the other dogs jobs are going to be "help" because if they out work or strike those certain dogs, I will be surprised. However my Buzz dog is only brought along as a "help" dog job in mind, and those few times he out struck the others I was definately surprised.
I will say with confidence, that Buzz is not a whole package kind of dog, as with most all dogs they will excell in certain areas better than others, I know if I took just this dog and hunted him, I would have to change the way I hunted, I would have to make the wind direction my number one priority, and pay close attention that when he started throwing his head up to shut it down and give him some time and he can find and bay and might catch it too. I have had this dog break off from a pack of hogs on his own and stop and bay it, I watched without a catch dog, I alone tried talking him into catching the big sow, she would break and he would hit her in the ham and she would bay a few more minutes, and again break, I was trying to keep up and when she went up over the ridge with him dragging, I went to the to p as a fast as I could as he was baying again. Then when she madea mad dash he hit her a few more times and she did not stop she was in open pasture and headed for the river. The next time He hit another gear and grabbed her ear and MADE her stop, as he did not let go, SDhe was caught and under control, all out in wide open, luckily one of the guys on horseback got there before me out of breath could. The sow went over 200lbs on the scale. So some might call him a running catch, and at times that is what he does "catch" but other times he will bay, so He does not qualify as a real catch dog.
The whole Running catch thing is another subject that has way too many definitions, and can get heated in a hurry also.
Here is the thing, this dog does not go to a bay and break a hog, where as many other dogs that are this gritty are known to do. I can't remember not one time that this dog made it to a bay or was at a bay from the start where a hog got away. I know there are several times he has not got all the way there and it broke and we did not catch a hog. There was several pages of discussion awhile back about dogs that "shut them down" or "make them bay" alot of good points made and discussed.There is a fine line between a dog that is gritty/rough and one that will break a bay or push a hog. I am not saying this dog does any of that but my experience tells me, that so far this dog makes it to the bay, he is going to help hold the bay until I can get a read deal catch dog to him.
He does not qualify as a strike dog, can't really call him a catch dog, not sure he will bay, so the term Bay dog is out, but consistantly he "helps" get the hog to its final destination, which is "Caught", therefore I feel HELP DOG is the best label for this particular dog.
I feed him and will continue to use his retarded acting self as long as I can. I have had several that were over the top rough, and this one has a certain finesse, that makes me appreciate him, when others similiar I would not keep on my yard. I have no intentions of breeding this dog, although he has sired one accidenatl litter, I kept one of the pups for myself and he is not yet a year old but already finding hogs in the training pen, but not confident enough to stay with one when it breaks, we will see how he does with some more age, if he takes after his daddy I will most likely keep him on as a replacement for his daddy, But I do not actively go out seeking dogs with this talents, when they turn up and they suit me they have a home with job security.