As a former shop manager I totally agree with you. I used to get this a lot especally with mobile phones where people 'expect' a discount. But, I would also remeber those people who tried to barter down and certainly wouldn't give them the same level of service when they came back to the shop with queries. 10 -15% less customer service next time you come into my shop asking for help or my time and expertise. I think that is fair, no? Of course I may have just told you to piss-off :P