What is the average dealer mark up?

In the end, I think that what matters is that it's a free world, at least in America, and you can't tell business owners what they are suppose to charge or how much profit they're supposed to make. Nor should you want to. Too much price control would just water down the creativity and expertise that goes into the advanced audio gear we enjoy today. I don't expect that audio dealers are making a killing because most are in high end neighborhoods that have high rent and have to keep the place looking nice along with retaining and paying reliable and knowledgeable staff. If they are making big profits, more power to them and foo on me for not doing the same.  Having been in business myself I know it's not a gimme to run a successful business.  I want to shop audio where the staff is knowledgeable, can demo the gear in a way that I can relate to, and is there when I need help.  You'll never be able to control prices or profits.  You yourself may open a business some day and then you'll see why things cost what they do.