I have performed many Rhinoplasty Surgeries over the past 25 years and while I can't speak for every surgeon here are our factors that determine cost:
- Difficulty of Rhinoplasty based on prior operations.
- Number of techniques that need to be used during the Rhinoplasty or stated another way, how much needs to be done to the nose like removing the hump, breaking the bones, thinning the tip etc.
In general, you'll find that more experienced Rhinoplasty Surgeons, in practice for many years with strong reputations charge more for similar cases. You pay for that experience as in all things. Hope that helps.
Web reference: http://www.drfpalmer.com/Rhinoplasty.html