I agree entirely. I'm a recent grad and I know I spent more than $2,600 in a year across all types of alcohol, but I was purchasing for parties, not for myself, and insisted on quality booze. Your average student is most definitely not purchasing top-shelf alcohol in party quantities. And $1700 for a computer? I paid that for the three computers I had, even including all of the upgrades on the desktop. Never paid more than $500/year on books. I'm willing to bet most people are not paying all three of lab fees, music room fees, and Greek dues. And a number of other costs here are simply ridiculous, representing upper bounds more than averages in many cases.
bar spending? $50/weekend * 52 weeks in a year = $2600/year. I did much worse than that I have to admit. And don't start with 'most college students are under 21' because most people I knew were resourceful when it came to age modification, not to mention our proximity to Mexico :)