Do Dealers think it is sinful..........

..... to give a customer a break on the price of high end audio equipment? is there something ethically wrong with this? why is it that i can negotiate down the price of a car or real estate many thousands of dollars, but i cant even get a discount on something the dealer (1) doesnt stock, (2) will not let you bring home for a day. i feel that when you are spending big $, like 8k + on a sale there should be some give and take. what do you think?