I'm no expert, I just like to give my oppinion on everything.

So, I would say that you need to think about what skills the dog has. What are the dogs pros and conns (every dog has both), and what value do you place on the dog. Now, think about what other people would be willing to pay for this dog, and take into consideration how fast you want the dog to sell and what kind of economic situation the nation is facing (that will have a lot to do with how much money people are willing to spend on a luxury item.).
That's just an oppinion...all my dogs were free.

I think this response sums it up. I will add that in my opinion (which is not much), any deal whether it is a dog deal, treestand deal, land, ect. ect., is only good if after it is all said and done, both parties were happy with it. If I'm content to sell a finished dog for $2000, and the purchaser is happy to have paid it after hunting the dog, then it was a good deal. If however, you charge someone $500 for the same dog, beign completely honest about the dog's pro and cons, and the new owner does not feel they got their monnies worth, then bring the dog back and make it right.