I was in the moving industry for 13 years. Yes, people typically tip. The cost of a move may seem very expensive, but most of the guys doing the hard labor do not make very much at all. The moving industry is far more complicated than people believe it to be. There is a lot that goes on behind the scenes. Anyway, the average customer would buy lunch and tip maybe $15-$30 per guy depending on the size of the home and number of movers. If people were really happy they would tip more, but remember if you are moving interstate you will also have a crew at destination to consider. If it is a local move and happening all the same day then I would wait until delivery to assess the situation... Maybe even hint to the driver that you will handle the tip on the other end.
Good luck. My husand is still in the moving industry. That is all we know. If you have any more questions I am more than available to talk to you.