It is a question we have to ask ourselves. In general, the younger you are the more booze gets consumed at your parties. A wedding reception is no different.
If your crowd skews younger, consider bumping up the minimums for both the initial two hours and the hourly rate of consuming that follows. For my friends, admittedly a crowd of enthusiastic drinkers who would benefit from the public transit system here in New York City, I might suggest something like this:
Photo courtesy Matt Kowel via Flickr/CC