I quickly tire of this kind of bargaining, particularly because most sellers' 'friendliness' invariably turns to anything between indifference and hostility as soon as they understand that you are wise to their game and they will not make the tourist premium off of you. On more than one occasion in Turkey, sellers have abused me just because I refused to budge from a price I knew was reasonable (which I had gotten in other shops).

At least this is true for tourist destinations. I've had more enjoyable experiences off the beaten tourist path in South East Asia. Generally though, in the long run it grows tiring to have to spend twenty minutes negotiating every time you go in a shop.