Purchasing a hunting dog can do nothing but add to the pleasure of the sport – if done correctly. I have seen more than one dog point a covey a quail, wait for the flush, then point the first of many singles before the shooter has vested the first bird. On the other hand, I've also been on the side of the road in the middle of nowhere, Kansas, chasing a dog that refused to hunt or return to the car, as the group debated whether to leave just the dog, or the owner and his dog, to fend for themselves while we went to the closest restaurant for supper.
You never want to be “that guy” in the field, the one with the dog who doesn't obey, can't locate birds, or can't retrieve. Instead, you want to be the one that is called when a friend has wrangled a new hunting spot. With a good dog, you will be.