Why do people use help dogs?

I will give you a for instance, and several people on here have seen my Buzzard dog, he stays within eye sight of me if were are driving ATV, he usually running beside me. If he winds something he is gone, if he hears something he is gone, he is really fast and will be too another dog in a flash. He is not busting tail full speed the whole hunt like some of my dogs do, so when the strike and a race might begin, Buzz gets there and is fresher, with alot of stamina. He acts like a pet that wants to be under my feet 89% of time. The times we are driving and he heads out, he either winded or heard another dog, I trust him. We stop and we wait, I can trust him before the Garmin knows whats going on, I guess he "Helps me too".
Now October 22, this same dog, winds across an open pasture and when he was going away from us in the opposite direction we were driving, at about 180 yards and too fast too be trailing, all other dogs are the other direction, I knew he was about to find his own at 280yds he started baying, within 10 more yds the boar was caught and over. Because he does not really leave my sight, and he is usually not the one finding the hog, although he is capable, he is just not going to outwork my other dogs in the looking through the brush I only call him a help dog, most people would not own him because he stays too close to me.
Truthfully, I would not sell him even if someone was waving good cash under my nose, because to me he serves a quality purpose.
I opnly need one dog out finding the hogs, unless we have alot of help, I can only catch one hog at a time anyway.