After reading the entire thread, I'm sort of shocked by most of the opinions.
It's likely that I'm making a lot more than the delivery guy. So for me, $20 to make his day and to encourage him to place the machine in my garage and wait for me to unpack it is a small price to pay. I know for a lot of people cash is (their) king. But for me, I never let it get in the way of treating people right. For me, the $20 is not too significant, i'll never miss it, and probably means more to the delivery guy that it does to me. And before you think I was born in to money or something, I was the child of a single mother in a trailer park and took seven years to pay my own way through college while working two jobs and raising three children.
As for the restaurant, I try to leave 20% unless I have to get my own food, then it's less.
If you want to see the power of tipping, consider this: I have soon to be nine children. When I take most of them to a restaurant I've never been to, the waitresses fight because no one wants our table. But if I tip my normal 20%, the next time, they fight because they want our table.
The same is true for the delivery guy. If I continue to buy grizzly machines, there's a good chance that the same saia delivery guy will bring me the machine. In the past, I could tell that some of the drivers were jealous of my shop, either because of things they said, or just the look on their face. I think the $20 in this case does several things. From an interpersonal relationship standpoint, it ensures that they'll remember me the next time. It (most likely) ensures good service this time. It brightens their day. And from a practical standpoint, it may prevent them from showing up at 3am to clean out the shop.
You might view this as an extorti> When a truck driver drops a pallet in your garage, is he expecting a tip?
I don't think they're expecting it. I give them a $20.
UPS is different.
I agree when it's not clear what the rules are. Russia is a tipping culture and I had nothing but problems there. The translator said restaurants are 10%, I left more because it felt wrong. The bellhop in moscow thought I was a cheapskate for tipping him $5.
brian