I can think of a few, but that was my first thought as well, how hard is it to make a nice cup of coffee at home? A semi-decent espresso machine and it'll be better than a tepid drone-delivered one any time, long as you have the coffee grounds/beans.

I'd probably use it for times I've run out of something essential I don't have at home though, if its quick enough. Tobacco after a few beers and not wanting to drive, exotic spices I can't find locally assuming the drone can fly far enough to other places, and also assuming its more environmentally friendly than getting in the car and burning petrol.