Yikes, $11 for Moscow mule ingredients. Seeing as how it's a vodka drink, I can't imagine that the grocery cost of the basic ingredients would be like a few dollars and then maybe (keyword maybe) a dollar for a shot of vodka.
I haven't gone out drinking very often, but I do glance at cocktail menus and can't recall the last time I saw a Moscow Mule for more than $8, and this was at a largely premium place.
Then again, the company has to make a profit somehow and if people are lazy, they likely don't mind paying a premium for the convenience.