I can only draw the obvious conclusion from their database that beer is $0 a pint almost everywhere.
Even if people actually cared enough to enter real prices, what good does it do you to average the prices of $3-5+ pints of micros with $1 pints of natty light on special?
I saw that today too, but I'd actually seen the site a month ago when I was wondering what the price of beer in Ireland was as I was going to be going on vacation there.