My understanding was that it was changed from 90 day to 90 in 180 days to address the "island hopping" permanent stayers avoiding residency Paul. It is not possible to be in Turkey permanently under this new system. It wasn't about money (making it or saving it) - it was to ensure that all non-nationals permanently in Turkey have residency, which is fair enough. Bloody confusing now though for the regular holidaymaker visiting Turkey several times a year.