Why do people use help dogs?

I have a full balls to the wall hog dog that will out strike anything i got off of the hood. He has a nose like all get out. I use to run all my dogs on the ground and he "lightning" Would behind the truck. He had never struck a hog ever but he would always go to the bay. Well One day I was just tired of him running behind the truck and not hunting and was going to sale hime to a guy the following week. I loaded the dogs for one last hunt got to the spot. Let all the dogs out to hunt got into the truck and heard a dog back up. I noticed it was him and i just said, leave that piece of trash back there. Well about five minutes later he got on the cab, Then on the hood.I had had at the time red blinking lights on all my dogs and could see the strike dog out there about 250 yards or so. Well he stuck his nose into the air off of the right side of the truck and started running back and forth on the truck. I stop and he rolled out to about 500 yards and bayed up. The rest is history. This is not a story about a dog that was young and all the sudden turned on because to this day no matter what dog or if by hisself he will not leave the truck to hunt on the groung. And to most this dog would be worse then cull. The dogs that are lots are calling cull may be very good dogs just not your style of dogs. He to most hunters would be the biggest piece of trash in the world, but to me he is amazing. I have hunted with many of people that there dogs were out 350 to 400 yards on the ground and he will roll off the hood and outstrike them. So would that be cull to most of you ground hunters i would say so, but really the dog had a hidden talent that took time to show.