I am a seasoned mover, have moved 10 times in 18 years due to DH's military career. I am not sure if it is because these are military moves and we don't pay for them, but I have never tipped our movers, nor have I heard of this before. I do however feed the movers and give them beverages. Typically for breakfast I will buy Dunkin Donuts and coffee and for lunch we will order a few pizza and soda. In Italy where we couldn't have fast food we provided pastries and expresso in the AM and for lunch the first day we bought sandwich meat, rolls, chips and caprese salad and the second day we made hot dogs and chips (Italians love american hot dogs, 4 guys ate 24!)