Not sure what you are getting at, but can imagine.
Set with a salesman for awhile, and talk to one about the number of people who just come in to sit and chit-chat, waiting for a 'better' deal or just asking questions. Then think of what that person needs in the way of compensation for doing that 9-10 hours a day.
I think the salesman should start a clock or timer running and charge the customer for the time he takes, maybe $2-5 an hour, asking questions. I am not a salesman, but know some and have worked with some. I also know very well the guy that just spends his time going from salesman to salesman, being a real nuisance until finally to get rid of him, a quote is made and a deal struck.
I ask for the price, and ask for the best deal, and maybe offer a price if such and such is included (doesn't always work, but lets them know I'm after more for less). I then make up my mind whether I will pay that price. I don't beg for more knocked off nor am I interested in what the salesman and/or the dealer is making off the deal. They set the price, I make an offer, and if accepted, I decide if its right in my mind to spend my money that way.
Maybe I'm too easy on the salesman, but its the way I would want to be treated if I was selling.