Having some guidance on what your prices for various items should be is important. This is why a price guidance program for excel is probably a good way for you to generate the types of prices that you honestly need. When you look at a program like this, you are far more likely to get the type of answer that you honestly need.
That is the goal of anyone who is in the business of finding out what they should do for their small business. Do not let the opportunity to set your prices the ways that you want them pass you by.