I'm sure this has been discussed somewhere before, but I can't find a thread.
Is there (or *should* there be) a standard practice for tipping when one picks up food to go? I never used to tip in this situation, and my observations suggest that most people don't. But lately I've been leaving tips -- generally around 10% -- for the folks who put my order together, especially at places that I frequent and where the help is extremely friendly and accommodating, on the theory that these folks, too, probably depend on tips to supplement salaries that are set artificially low in the expectation that tips will be forthcoming.
Is this a reasonable presumption?