As much as he can or as little as he'll take. That's capitalism in action and I've grown kind of fond of it over the years. /w3tcompact/icons/smile.gif
No one ever worries about how much the grocer makes on a can of corn or a candy bar (probably a much higher percentage markup). We just look at the price and either buy it or don't.
If you want a fixed price, pay the manufactuer's suggested retail price. Of course, no one wants to do that. Maybe I'm a bit biased here. I've been on the other side of the table for about a quarter century now. /w3tcompact/icons/smile.gif