All I can say is it appears most of the posters here have not been out of the USA. Many of the countries I have visited/lived in during my 23 years in the military, the culture is to negotiate....it is a fun thing that is expected.
In a number of the second and third world countries you start at 50% less, listen to them cry, they then come down 10-15%, you groan (or start to walk away) and they come down another 10-15%. You buy it, they still probably made 20% over costs and you got it for 20-30% less then the initial price....Both are winners.
OTOH, when I was out with my spouse and she saw something she wanted (can you spell jewlery?) she would just say 'I love it'. The salesperson knew I was sc----ed and I would have to pay the first price.