Tipping is a personal thing and in my opinion a tip is only given after a satisfactory service.
The Taxi driver from the airport I give 20 ytl about £8 and there are 3 of us I give this on both journeys.
The barmen at our apartments who also looks after all our needs I give £20 after my fortnights holiday.
Restaurents I stopped Tipping because the wife picked up all my tips one year and they amounted to £75 that is equal to 2 evenings out.
That is my tipping and as I say people do there own thing but you tip how much and as often as you can afford or want to.
Gene