There are two things which determine what a dog is worth.
#1 - What the seller thinks it's worth
#2 - Why the buyer thinks it's worth
Beyond that, it could be anywhere from free to $10,000.
I will say that buying a couple hundred dollar dog and expecting it to actually be something is like buying a lotto ticket and honestly expecting to win. It might happen, but the chances are slim!
Unless it is a young dog up to 2 yrs old......anyone who says they have a 2 yr old finished dog will sell you lots of things......In my opinion......