I most certainly do spend roughly that amount most holidays I budget 10k plus per day plus hotel and car hire etc. its only 200 poundsAdd to that these predictions of foreigners spending 6-8k a day on holiday here compared with 4k Thai. Where do they get this drivel from? Maybe I'm the exception to the norm but I've never paid anywhere near that for a day in Thailand.
That said dual pricing is not likely to change and as I am not an expat I guess I have differing economic circumstances.