It's not always about the salary. How about longterm goals? It's easy to say go practice in Alaska and make alot of money, but are you going to be happy in Alaska? Desirable areas tend to have lower dentist income (on average, but not always), but they are desirable for a reason. How about the quality of schools if you have kids. What is the business climate for a particular region. What are the political tendencies for a particular area?
If your end goal is practice ownership. Well .... it takes years and years to develop your practice. If you start in one area of the country and then decide to move .... then you will need to start all over.
So. It's not always about the money.