This is an interesting discussion to me mainly because I can't figure out where you guys are getting your take out! Chefs who need tips to make ends meet? Bartenders who prepare the take-away orders? I don't think I'd care to have food from a place that doesn't pay their chefs well or makes their bartenders do double duty. The fanciest restaurant I can recall getting take-out from was taken care of by the manager, but usually it's someone on the host(ess) staff.
I've honestly never considered giving a tip to a cashier for the privileged of patronizing their establishment. And I'm usually considered an excessive tipper. It drives Mrs. P crazy that I tend to tip wait staff (if they're good) by the hour regardless of the cost of the food.
We buy our whole bean coffee from a local roaster and have been doing so for 14 years. We typically go through 1-1/2 pounds per week between home and the office so I know these people pretty well. This roaster also has coffee bar where they prepare and sell drinks and the register just happens to next to the drink bar (for obvious reasons). One day while picking up my order, the roasters wife, Alice, swiped my debit card and brought me the receipt which I signed. She looked at the empty tip line and looked me right in the eye and said, "Nice tip." And she wasn't kidding.
Now I ask you this, is that a proper attitude? Resenting not getting a buck tip for someone who's spent at least $12.00 per week on whole beans with your company for 14 fucking years? Keep in mind that if I ever get a drink at that store that I have never failed to tip whoever prepared my drink, including Alice. I'd been bringing them a bottle of wine for Christmas for a decade to show my appreciation for their excellent product...and I'm not even Christian!
Her husband raced over when he saw the storm cloud on my face, shooed Alice away, credited my card and gave me the beans. I think the tip culture is getting out of hand. Apparently he felt the same way.