Undoubtedly our celebrities are well-compensated for their appearances. Without them our talented professionals would not have a weekly television outlet for their talent. I'm sure the discrepancy is wide. However, for our celebs, this is a one-off, not a recurring job. The top pros have some job security. Their vested interest is seeing their celeb place high so they can be invited back for the following season.
These are the conditions to which our pros sign on for when they agree to be on the show . . . to be paid less than the celebrity they are there to teach. As contract employees, yeah, that must gnaw a little at the soul. Still--they are much better remunerated for getting to do what they love than most of their peers in dance, and the show has made them stars in their own right. They have chosen a tough discipline, where it is truly extraordinary to be able to make any money at it at all. Relatively speaking, other forms of 'entertainment' represented by our celebrities have a bit of a better return. And Bristol Palin's only claim to fame is having a famous mother!
Still, I think the judges' focus is, and should be, on the celebrity partners. A pro shouldn't take it to heart whether they are fawned over or ignored--their feedback comes best in the growing confidence of their celebrity. Every time they win a round, that is the vindication of their efforts.