It's a one time purchase that likely cost you significantly, in which the cost likely included the delivery and professional installation. I didn't tip the Diamond guys when they came to deliver and install our 7-foot Smart table a few years ago, although I did offer to buy their lunch here for them. They did it as fast as they possibly could, and I'm sure they could have done a more precise leveling job if they'd taken a little more time. I guess I feel if I could have afforded it, I would have tipped them a little. After re-covering our table the first time and seeing that the rails had previously been re-covered, although I had ordered and paid a premium price for a brand new table Diamond was custom making for me, I was glad I hadn't tipped them, although I'm sure their installers had nothing to do with that.Two guys came from Diamond, but one did most of the work. It took maybe 90mins max, single slate and felt was already on the table.
I think I gave the guy $30.
I would and I do tip my regular table mechanic when re-covering our table or tables, or my tip repairman, when re-tipping my cues. These are guys I'll be dealing with regularly in to the future, so I just feel it's good business to tip them for a good job, as long as I feel their fees are not out of line.