Have only negotiated when asked,an that`s only been once for ST in the afternoon. She wanted 1k I said 600.She laughed and said "no problem" as they do. However after 3 hours,full body massage and the best BJ I`ve ever had I gave her 1k and took her to dinner!
Ususally though as other Board Members have said 1k next to mobile or next to her clothes whilst she is in the shower next day saves any uncomfortableness. I did on my last sojourn give my young lady 1200b however she took me to her bar in the afternoon and bought me drinks with the extra I gave her(bless her!).