I am of the western mind set that tipping employees gets you some positive reward on future visits. Not even sure how true that is. I used to be a waiter and appreciated tips but if I saw a reliable tipper down the road, I did try a little harder to be jovial with them.
I tip at my local massage shop if the massage is outstanding but I notice that in future visits, the employees that I tipped seem completely indifferent to my visit. There is no huge smile, nod, or increased level of service compared to the employees I haven't tipped.
So it begs the question, is there any evidence that tipping is beneficial here?