The value of a tobacco pipe depends on a lot of things. The value of different pipes in the used market is usually driven by the market itself. There aren't really a lot of 'given' details that you can depend on. Of course, the tobacco pipe values that you're talking about do make a difference. New pipes that come from leading brands or carvers are going to be worth more than cheaper styles or mass-produced pipes that aren't so unique. The material that a pipe is made from will affect its value, as well.
If you are trying to understand tobacco pipe values and how they affect the pipes that you buy or sell, here are some things to keep in mind:
Subjectivity is a big part of tobacco pipe values. Everyone has different ideas of what pipes are worth and what they should pay. Used pipes and new pipes alike all have different values for different people. You're going to have to get to know the market and figure out what you're willing to pay for. There isn't a real pricing standard, except for the fact that some pipe brands or names will sell at higher prices because they are more valuable and that some materials are of a higher quality so they will get higher prices. Other than that, the value of tobacco pipes can vary significantly throughout the market.