maybe... some of this stuff is so cheap at their level the price differential is basically non existent.. but the profit margin isn't... does carpet cost any more for them than a rubber floor? does a plain plastic door panel cost alot less than a plastic door panel with some shiny bits?Of course options increase profits-however they have costs to the manufacturer as well.
do two colors of paint really cost more on their end. Aluminum rims versus steel? etc..
you want all terrain tires, they charge you 900 bucks... but you know they don't pay 900 dollars more for them, probably more like 20..